407 lines
10 KiB
Lua
407 lines
10 KiB
Lua
-- This script is given to the public domain
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-- It was originally intended as an april fool's joke in 2007, though it never really caught on.
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-- You're encouraged to experiment with this if you have plenty of time.
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-- Even if it's made as a joke, it does show that "anything is possible with ASS, although some things are insane to try."
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script_name = "Raytracer"
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script_description = "Reads subtitles as a scene description and raytraces the scene"
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script_author = "jfs"
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script_version = tostring(math.pi)
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include("utils.lua")
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max_iter = 3
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function raytrace(subs)
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aegisub.progress.task("Reading scene...")
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local lights, tris, camera, xres, yres = read_scene(subs)
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aegisub.progress.task("Raytracing...")
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local curp, totalp = 0, xres*yres
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for y = 0, yres-1 do
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aegisub.progress.task(string.format("Raytracing, line %d/%d...", y+1, yres))
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for x = 0, xres-1 do
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aegisub.progress.set(curp/totalp*100)
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local l = trace_point(x, y, (x+0.5)/xres, (y+0.5)/yres, lights, tris, camera)
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if l then
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subs.append(l)
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end
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curp = curp + 1
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end
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end
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aegisub.progress.task("Done.")
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aegisub.progress.set(100)
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end
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function trace_point(px, py, x, y, lights, tris, camera)
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-- fixme, assume a camera here ignoring defined one
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local vec = vector.norm( { 2*x-1, 1-2*y, -1 } )
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local r, g, b = trace_vec({0,0,-1}, vec, lights, tris, 0)
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if not r then
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return nil
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end
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r, g, b = clamp(r, 0, 255), clamp(g, 0, 255), clamp(b, 0, 255)
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-- todo, make line
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local l = {
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class = "dialogue",
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section = "Events",
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comment = false,
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layer = 0,
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start_time = 0,
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end_time = 3600*1000, -- one hour
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style = "p",
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actor = "",
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margin_l = 0,
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margin_r = 0,
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margin_t = 0,
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margin_b = 0,
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effect = "",
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text = string.format("{\\pos(%d,%d)\\1c&H%02x%02x%02x&\\p1}m 0 0 l 1 0 1 1 0 1", px, py, r, g, b)
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}
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return l
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end
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function trace_vec(org, vec, lights, tris, iter)
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if iter > max_iter then
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return 0, 0, 0
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end
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local hit = find_intersect(org, vec, tris)
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if not hit then
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return nil
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end
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-- got intersection, calculate lighting
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local r, g, b = hit.t.c.r*10, hit.t.c.g*10, hit.t.c.b*10
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local ray_cos_theta = vector.dot(hit.t.n, vec)
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hit.p = hit.t.p[1]
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hit.p = vector.add(hit.p, vector.scale(vector.sub(hit.t.p[2], hit.t.p[1]), hit.u))
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hit.p = vector.add(hit.p, vector.scale(vector.sub(hit.t.p[3], hit.t.p[1]), hit.v))
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for i, l in pairs(lights) do
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-- shadow ray
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local lvec = vector.sub(l.p, hit.p)
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local shadow = find_intersect(hit.p, lvec, tris)
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if not shadow or (shadow and (shadow.dist < 0 or shadow.dist > 1)) then
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-- not in shadow
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local lvecs = vector.len(lvec)
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-- diffuse component
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local light_cos_theta = math.abs(vector.dot(hit.t.n, lvec))
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-- specular component
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local cos_alpha = vector.dot(vector.sub(vector.scale(hit.t.n, 2*light_cos_theta), lvec), vec)
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local cos_n_alpha = cos_alpha^3 -- arbitrary constant for now
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-- add up
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r = r + l.c.r*hit.t.c.r * (light_cos_theta*0.6 + cos_n_alpha*0.4) / math.max(lvecs,1)
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g = g + l.c.g*hit.t.c.g * (light_cos_theta*0.6 + cos_n_alpha*0.4) / math.max(lvecs,1)
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b = b + l.c.b*hit.t.c.b * (light_cos_theta*0.6 + cos_n_alpha*0.4) / math.max(lvecs,1)
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end
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end
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-- reflection
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local rvec = vector.sub(vector.scale(hit.t.n, 2*vector.dot(hit.t.n, vec)), vec)
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local rr, rg, rb = trace_vec(hit.p, rvec, lights, tris, iter+1)
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if not rr then
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rr, rg, rb = 0, 0, 0
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end
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r = r*0.75 + rr*0.25
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g = g*0.75 + rg*0.25
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b = b*0.75 + rb*0.25
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return r, g, b
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end
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function find_intersect(org, vec, tris)
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local intersec = nil
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-- find closest intersection
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for i, t in pairs(tris) do
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local dist, u, v = intersect_triangle(org, vec, t)
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if dist and dist > 0 then
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if not intersec or intersec.dist > dist then
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intersec = {dist=dist, u=u, v=v, t=t}
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end
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end
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end
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return intersec
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end
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function intersect_triangle(org, vec, triangle)
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-- taken from http://www.graphics.cornell.edu/pubs/1997/MT97.html
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-- find vectors for two edges sharing point 1
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local edge1, edge2 = vector.sub(triangle.p[2], triangle.p[1]), vector.sub(triangle.p[3], triangle.p[1])
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-- begin calculating determinant - also used to calculate U parameter
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local pvec = vector.cross(vec, edge2)
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-- if determinant is near zero, ray lies in plane of triangle
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local det = vector.dot(edge1, pvec)
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if det > -0.00001 and det < 0.00001 then
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-- parallel to plane
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return nil
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end
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local inv_det = 1 / det
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-- calculate distance from point 1 to ray origin
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local tvec = vector.sub(org, triangle.p[1])
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-- calculate U parameter and test bounds
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local u = vector.dot(tvec, pvec) * inv_det
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if u < 0 or u > 1 then
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-- crosses plane but outside triangle
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return nil
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end
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-- prepare to test V parameter
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local qvec = vector.cross(tvec, edge1)
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-- calculate V parameter and test bounds
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local v = vector.dot(vec, qvec) * inv_det
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if v < 0 or (u+v) > 1 then
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-- crosses plane but outside triangle
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return nil
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end
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-- calculate distance, ray intersects triangle
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local dist = vector.dot(triangle.p[3], qvec)
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return dist, u, v
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end
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function read_scene(subs)
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local lights = {}
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local tris = {}
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local camera = { pos = {0,0,-1}, up = {0,1,0}, plane } -- fixme
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local xres, yres = 384, 288
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local style = {
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class = "style",
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section = "V4+ Styles",
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name = "p",
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fontname = "Arial",
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fontsize = "20",
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color1 = "&H00000000&",
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color2 = "&H00000000&",
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color3 = "&H00000000&",
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color4 = "&H00000000&",
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bold = false,
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italic = false,
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underline = false,
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strikeout = false,
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scale_x = 100,
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scale_y = 100,
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spacing = 0,
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angle = 0,
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borderstyle = 0,
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outline = 0,
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shadow = 0,
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align = 5,
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margin_l = 0,
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margin_r = 0,
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margin_t = 0,
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margin_b = 0,
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encoding = 0
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}
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local i, maxi = 1, #subs
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local replaced_style = false
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while i < maxi do
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aegisub.progress.set(i / maxi * 100)
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local l = subs[i]
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if l.class == "dialogue" then
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parse_line(l, lights, tris, camera)
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subs.delete(i)
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maxi = maxi - 1
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elseif l.class == "style" then
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if replaced_style then
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subs.delete(i)
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maxi = maxi - 1
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else
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style.section = l.section
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subs[i] = style
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replaced_style = true
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i = i + 1
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end
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elseif l.class == "info" then
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local k = l.key:lower()
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if k == "playresx" then
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xres = math.floor(l.value)
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elseif k == "playresy" then
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yres = math.floor(l.value)
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end
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i = i + 1
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else
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i = i + 1
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end
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end
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return lights, tris, camera, xres, yres
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end
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function parse_line(line, lights, tris, camera)
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local val, rest = string.headtail(line.text)
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if val == "light" then
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local pos, color = {}, {}
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val, rest = string.headtail(rest)
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pos[1] = tonumber(val)
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val, rest = string.headtail(rest)
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pos[2] = tonumber(val)
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val, rest = string.headtail(rest)
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pos[3] = tonumber(val)
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-- these work as intensity values so they should probably be high
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val, rest = string.headtail(rest)
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color.r = tonumber(val) or 0
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val, rest = string.headtail(rest)
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color.g = tonumber(val) or 0
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val, rest = string.headtail(rest)
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color.b = tonumber(val) or 0
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local light = {
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p = pos,
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c = color
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}
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table.insert(lights, light)
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elseif val == "tri" then
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local coord1, coord2, coord3, color = {}, {}, {}, {}
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val, rest = string.headtail(rest)
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coord1[1] = tonumber(val)
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val, rest = string.headtail(rest)
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coord1[2] = tonumber(val)
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val, rest = string.headtail(rest)
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coord1[3] = tonumber(val)
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val, rest = string.headtail(rest)
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coord2[1] = tonumber(val)
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val, rest = string.headtail(rest)
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coord2[2] = tonumber(val)
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val, rest = string.headtail(rest)
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coord2[3] = tonumber(val)
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val, rest = string.headtail(rest)
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coord3[1] = tonumber(val)
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val, rest = string.headtail(rest)
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coord3[2] = tonumber(val)
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val, rest = string.headtail(rest)
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coord3[3] = tonumber(val)
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-- these work as reflectivity values so they should be in range 0..1
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val, rest = string.headtail(rest)
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color.r = tonumber(val) or 0
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val, rest = string.headtail(rest)
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color.g = tonumber(val) or 0
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val, rest = string.headtail(rest)
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color.b = tonumber(val) or 0
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local t = {
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p = {coord1, coord2, coord3},
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n = vector.norm(vector.normal(coord1, coord2, coord3)),
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c = color
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}
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table.insert(tris, t)
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elseif val == "camera" then
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-- fixme, redefine
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val, rest = string.headtail(rest)
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camera.pos[1] = tonumber(val)
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val, rest = string.headtail(rest)
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camera.pos[2] = tonumber(val)
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val, rest = string.headtail(rest)
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camera.pos[3] = tonumber(val)
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val, rest = string.headtail(rest)
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camera.plane[1][1] = tonumber(val)
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val, rest = string.headtail(rest)
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camera.plane[1][2] = tonumber(val)
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val, rest = string.headtail(rest)
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camera.plane[1][3] = tonumber(val)
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val, rest = string.headtail(rest)
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camera.plane[2][1] = tonumber(val)
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val, rest = string.headtail(rest)
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camera.plane[2][2] = tonumber(val)
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val, rest = string.headtail(rest)
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camera.plane[2][3] = tonumber(val)
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camera.start_time = line.start_time
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camera.end_time = line.end_time
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else
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-- unknown, ignore
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end
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end
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vector = {}
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vector.null = {0,0,0}
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function vector.add(v1, v2)
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local r = {}
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r[1] = v1[1] + v2[1]
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r[2] = v1[2] + v2[2]
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r[3] = v1[3] + v2[3]
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return r
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end
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function vector.sub(v1, v2) -- v1 minus v2
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local r = {}
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r[1] = v1[1] - v2[1]
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r[2] = v1[2] - v2[2]
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r[3] = v1[3] - v2[3]
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return r
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end
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function vector.scale(v, s)
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local r = {}
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r[1] = v[1] * s
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r[2] = v[2] * s
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r[3] = v[3] * s
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return r
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end
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function vector.len(v)
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return math.sqrt(v[1]*v[1] + v[2]*v[2] + v[3]*v[3])
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end
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function vector.norm(v)
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local r, il = {}, 1/vector.len(v)
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r[1] = v[1]*il
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r[2] = v[2]*il
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r[3] = v[3]*il
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return r
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end
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function vector.dot(v1, v2)
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return v1[1]*v2[1] + v1[2]*v2[2] + v1[3]*v2[3]
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end
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function vector.cross(v1, v2)
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local r = {}
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r[1] = v1[2]*v2[3] - v1[3]*v2[2]
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r[2] = v1[1]*v2[3] - v1[3]*v2[1]
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r[3] = v1[1]*v2[2] - v1[2]*v2[1]
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return r
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end
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function vector.normal(p1, p2, p3)
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return vector.cross(vector.sub(p2, p1), vector.sub(p3, p1))
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end
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function raytrace_macro(subs)
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raytrace(subs)
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aegisub.set_undo_point("raytracing")
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end
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aegisub.register_macro("Raytrace!", "Raytrace the scene", raytrace_macro)
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aegisub.register_filter("Raytrace", "Raytrace the scene", 2000, raytrace)
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