Cheers!
That''s nice, since it allows for an early out for me:
if (t >= maximumAlreadyRecordedHitDistance)
return false;
Which will spare me a few more cross and dot products.
Thanksalot, can''t wait to implement it!
Ciao, ¡muh!
Raytracing
bool intersect_triangle(ray ray,v3 a,v3 b,v3 c,f32 old_t,f32& new_t,f32& new_u,f32& new_v) { v3 e1 = c - a; v3 p = ray.dir.cross(e1); v3 t = ray.orig - a; f32 det = e0.dp3(p); if(det<=0.f) return false; t /= det; if(t<=0.f || t>=old_t) return false; f32 u = t.dp3(p); if(u<=0.f || u>=det) return false; v3 e0 = b - a; v3 q = t.cross(e0); f32 v = ray.dir.dp3(q); if(v<=0.f || u+v>=det) return false; u /= det; v /= det; new_t = t; new_u = u; new_v = v; return true;} so thats what you like, right?
"take a look around" - limp bizkit
www.google.com
[edit] i forgot return true:D
[edited by - davepermen on October 2, 2002 9:12:20 AM]
Author
Yup ;-)
However, I can completely ommit the new u and v values, since I don''t need them.
Ciao, ¡muh!
However, I can completely ommit the new u and v values, since I don''t need them.
Ciao, ¡muh!
why ever.. don''t you need them for uhm.. texturing and lighting? well i do:D
"take a look around" - limp bizkit
www.google.com
"take a look around" - limp bizkit
www.google.com
Author
That''s only a dirtmap I''m building. It doesn''t do texturing and lighting, it only tells the renderer the amount of dirt for a certain pixel. It does that by sending out rays in a hemisphere and averaging the distance each ray needed to score the closest hit. However, since QMC sampling needs a quite high raycount to achieve more or less noise free images, and I cannot do subsampling, the raytracer has to be as fast as possible.
Thanks again for the routines!
Ciao, ¡muh!
Thanks again for the routines!
Ciao, ¡muh!
Author
BTW: I just noticed that your t magically changes from a vector to a float and back again...
Ciao, ¡muh!
Ciao, ¡muh!
Just wanted to add to the "SWEET PIC!!!!!!" thing 
My raytracer''s nothing on yours; for anyone following this thread and thinking "I have GOT to write one of those" though, it might be useful - small, OO, commented source.
Keep up the good work, the dirt particularly is excellant.
www.coldcity.com
code, pics, life
My raytracer''s nothing on yours; for anyone following this thread and thinking "I have GOT to write one of those" though, it might be useful - small, OO, commented source.
Keep up the good work, the dirt particularly is excellant.
www.coldcity.com
code, pics, life
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