diff --git a/.gitignore b/.gitignore
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+# Compiled Object files
+
+*.slo
+
+*.lo
+
+*.o
+
+*.obj
+
+*.exe
+
+
+# Compiled Dynamic libraries
+
+*.so
+
+*.dylib
+
+
+# Compiled Static libraries
+
+*.lai
+
+*.la
+
+*.a
+
+*/Debug*
+
+*Release*
+
+ipch
+*.sdf
+*.sln
+*.vcxproj
+/TGCViewer/*.filters
+*.user
+*.filters
+*.ncb
+*.opt
+*.plg
+*.suo
+*.vcproj
+Debug
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diff --git a/point_in_tri_test.htm b/point_in_tri_test.htm
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diff --git a/quad_perspective_tex.htm b/quad_perspective_tex.htm
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diff --git a/shaderdoy.c b/shaderdoy.c
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index 0000000..cd452fb
--- /dev/null
+++ b/shaderdoy.c
@@ -0,0 +1,181 @@
+
+
+const vec3 lb = vec3(-10,-10,-10);
+const vec3 rt = vec3(40,40,40);
+
+float ray_aabb(vec3 org,vec3 dir)
+{
+ float t = -1.0;
+
+ vec3 dirfrac;
+ dirfrac.x = 1.0 / dir.x;
+ dirfrac.y = 1.0 / dir.y;
+ dirfrac.z = 1.0 / dir.z;
+ // lb is the corner of AABB with minimal coordinates - left bottom, rt is maximal corner
+ // r.org is origin of ray
+ float t1 = (lb.x - org.x)*dirfrac.x;
+ float t2 = (rt.x - org.x)*dirfrac.x;
+ float t3 = (lb.y - org.y)*dirfrac.y;
+ float t4 = (rt.y - org.y)*dirfrac.y;
+ float t5 = (lb.z - org.z)*dirfrac.z;
+ float t6 = (rt.z - org.z)*dirfrac.z;
+
+ float tmin = max(max(min(t1, t2), min(t3, t4)), min(t5, t6));
+ float tmax = min(min(max(t1, t2), max(t3, t4)), max(t5, t6));
+
+ // if tmax < 0, ray (line) is intersecting AABB, but whole AABB is behing us
+ if (tmax < 0.0)
+ {
+ t = -1.0;
+ }
+ else
+ // if tmin > tmax, ray doesn't intersect AABB
+ if (tmin > tmax)
+ {
+ t = -1.0;
+ }
+ else
+ {
+ t = tmin;
+ }
+
+ return t;
+}
+
+float ray_sphere(vec3 ray, vec3 dir, vec3 center, float radius)
+{
+ vec3 rc = ray-center;
+ float c = dot(rc, rc) - (radius*radius);
+ float b = dot(dir, rc);
+ float d = b*b - c;
+ float t = -b - sqrt(abs(d));
+ float st = step(0.0, min(t,d));
+ return mix(-1.0, t, st);
+}
+
+void main(void)
+{
+
+ vec2 uv = (-1.0 + 2.0*gl_FragCoord.xy / iResolution.xy) *
+ vec2(iResolution.x/iResolution.y, 1.0);
+ vec3 D = normalize(vec3(uv, 1.0));
+ vec3 vLookFrom = vec3(0.0,0.0,-3.0);
+
+ float t = ray_sphere(vLookFrom,D , vec3(0.0,0.0,0.0),1.0);
+
+
+ if(t>-1.0)
+ gl_FragColor = vec4(0.0,0.0,0.0,1.0);
+ else
+ gl_FragColor = vec4(1.0,1.0,1.0,1.0);
+
+}
+
+const vec3 lb = vec3(-10,-10,-10);
+const vec3 rt = vec3(40,40,40);
+
+float ray_aabb(vec3 org,vec3 dir)
+{
+ float t = -1.0;
+
+ vec3 dirfrac;
+ dirfrac.x = 1.0 / dir.x;
+ dirfrac.y = 1.0 / dir.y;
+ dirfrac.z = 1.0 / dir.z;
+ // lb is the corner of AABB with minimal coordinates - left bottom, rt is maximal corner
+ // r.org is origin of ray
+ float t1 = (lb.x - org.x)*dirfrac.x;
+ float t2 = (rt.x - org.x)*dirfrac.x;
+ float t3 = (lb.y - org.y)*dirfrac.y;
+ float t4 = (rt.y - org.y)*dirfrac.y;
+ float t5 = (lb.z - org.z)*dirfrac.z;
+ float t6 = (rt.z - org.z)*dirfrac.z;
+
+ float tmin = max(max(min(t1, t2), min(t3, t4)), min(t5, t6));
+ float tmax = min(min(max(t1, t2), max(t3, t4)), max(t5, t6));
+
+ // if tmax < 0, ray (line) is intersecting AABB, but whole
+
+AABB is behing us
+ if (tmax < 0.0)
+ {
+ t = -1.0;
+ }
+ else
+ // if tmin > tmax, ray doesn't intersect AABB
+ if (tmin > tmax)
+ {
+ t = -1.0;
+ }
+ else
+ {
+ t = tmin;
+ }
+
+ return t;
+}
+
+
+float ray_sphere(vec3 p0,vec3 D,vec3 centro,float radio)
+{
+ float rta = -1.0;
+ // verifico si interseta con la esfera
+ vec3 aux = p0 - centro;
+ float c = dot(aux,aux) - radio*radio;
+ float B = 2.0*dot(D,aux);
+ float disc = B*B - 4.0*c;
+ if(disc>=0.0)
+ {
+ float t0 = (-B-sqrt(disc))/2.0;
+ float t1 = (-B+sqrt(disc))/2.0;
+
+ if(t0<0.0)
+ rta = t1;
+ else
+ if(t0>t1)
+ {
+ float aux_t = t1;
+ t1 = t0;
+ t0 = aux_t;
+ }
+
+ // entra en la esfera por t0 y sale por t1.
+ // se supone que el punto p0 NO esta dentro de la
+ // esfera, asi que t0, t1 son ambos positivos o ambos negativos
+ rta = t0;
+ }
+ return rta;
+}
+
+
+
+void main(void)
+{
+ vec2 uv = gl_FragCoord.xy / iResolution.xy;
+ float x =2.0*(uv.x-1.0);
+ float y = 1.0-2.0*uv.y;
+
+ vec3 vLookFrom = vec3(0.0,0.0,2000);
+ vec3 vLookAt = vec3(0,0,0);
+
+ vec3 N = normalize(vLookAt-vLookFrom);
+ vec3 V = normalize(N * vec3(0,1,0));
+ vec3 U = V * N;
+ const float fov = 3.1415 / 4.0;
+ float k = 2.0*tan(fov/2.0);
+ vec3 Dy = U*(k*iResolution.y/iResolution.x);
+ vec3 Dx = V*k;
+
+ // direccion de cada rayo
+
+ vec3 D = normalize(N + Dx*x + Dy*y);
+
+ float t = ray_sphere(vLookFrom,D , vec3(0.0,0.0,0.0),50.0);
+
+
+ if(t>0.0)
+ gl_FragColor = vec4(0.0,0.0,0.0,1.0);
+ else
+ gl_FragColor = vec4(1.0,1.0,1.0,1.0);
+
+}
\ No newline at end of file
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