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Render shadow buffer.

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yunfeibai
2016-11-21 09:13:20 -08:00
parent be5b8a3d7b
commit 5be4409a1a
2 changed files with 85 additions and 2 deletions
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31
examples/TinyRenderer/our_gl.cpp
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@@ -30,6 +30,7 @@ Matrix projection(float coeff) {
}
Matrix lookat(Vec3f eye, Vec3f center, Vec3f up) {
/*
Vec3f z = (eye-center).normalize();
Vec3f x = cross(up,z).normalize();
Vec3f y = cross(z,x).normalize();
@@ -44,6 +45,36 @@ Matrix lookat(Vec3f eye, Vec3f center, Vec3f up) {
Matrix ModelView;
ModelView = Minv*Tr;
return ModelView;
*/
Vec3f f = (center - eye).normalize();
Vec3f u = up.normalize();
Vec3f s = cross(f,u).normalize();
u = cross(s,f);
Matrix ModelView;
ModelView[0][0] = s.x;
ModelView[0][1] = s.y;
ModelView[0][2] = s.z;
ModelView[1][0] = u.x;
ModelView[1][1] = u.y;
ModelView[1][2] = u.z;
ModelView[2][0] =-f.x;
ModelView[2][1] =-f.y;
ModelView[2][2] =-f.z;
ModelView[3][0] = 0.f;
ModelView[3][1] = 0.f;
ModelView[3][2] = 0.f;
ModelView[0][3] = -(s[0]*eye[0]+s[1]*eye[1]+s[2]*eye[2]);
ModelView[1][3] = -(u[0]*eye[0]+u[1]*eye[1]+u[2]*eye[2]);
ModelView[2][3] = f[0]*eye[0]+f[1]*eye[1]+f[2]*eye[2];
ModelView[3][3] = 1.f;
return ModelView;
}
Vec3f barycentric(Vec2f A, Vec2f B, Vec2f C, Vec2f P) {