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Function names, code formatting...
This commit is contained in:
raysan5 2017-01-05 19:33:05 +01:00
parent 0369bb4c8c
commit 658c280669
6 changed files with 217 additions and 212 deletions
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81
src/shapes.c
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@ -534,84 +534,3 @@ Rectangle GetCollisionRec(Rectangle rec1, Rectangle rec2)
return retRec;
}
RayHitInfo RaycastGroundPlane( Ray ray, float groundHeight )
{
RayHitInfo result = {0};
if (fabs(ray.direction.y) > EPSILON)
{
float t = (ray.position.y - groundHeight) / -ray.direction.y;
if (t >= 0.0) {
Vector3 rayDir = ray.direction;
VectorScale( &rayDir, t );
result.hit = true;
result.distance = t;
result.hitNormal = (Vector3){ 0.0, 1.0, 0.0};
result.hitPosition = VectorAdd( ray.position, rayDir );
}
}
return result;
}
// Adapted from:
// https://en.wikipedia.org/wiki/M%C3%B6ller%E2%80%93Trumbore_intersection_algorithm
RayHitInfo RaycastTriangle( Ray ray, Vector3 a, Vector3 b, Vector3 c )
{
Vector3 e1, e2; //Edge1, Edge2
Vector3 p, q, tv;
float det, inv_det, u, v;
float t;
RayHitInfo result = {0};
//Find vectors for two edges sharing V1
e1 = VectorSubtract( b, a);
e2 = VectorSubtract( c, a);
//Begin calculating determinant - also used to calculate u parameter
p = VectorCrossProduct( ray.direction, e2);
//if determinant is near zero, ray lies in plane of triangle or ray is parallel to plane of triangle
det = VectorDotProduct(e1, p);
//NOT CULLING
if(det > -EPSILON && det < EPSILON) return result;
inv_det = 1.f / det;
//calculate distance from V1 to ray origin
tv = VectorSubtract( ray.position, a );
//Calculate u parameter and test bound
u = VectorDotProduct(tv, p) * inv_det;
//The intersection lies outside of the triangle
if(u < 0.f || u > 1.f) return result;
//Prepare to test v parameter
q = VectorCrossProduct( tv, e1 );
//Calculate V parameter and test bound
v = VectorDotProduct( ray.direction, q) * inv_det;
//The intersection lies outside of the triangle
if(v < 0.f || (u + v) > 1.f) return result;
t = VectorDotProduct(e2, q) * inv_det;
if(t > EPSILON) {
// ray hit, get hit point and normal
result.hit = true;
result.distance = t;
result.hit = true;
result.hitNormal = VectorCrossProduct( e1, e2 );
VectorNormalize( &result.hitNormal );
Vector3 rayDir = ray.direction;
VectorScale( &rayDir, t );
result.hitPosition = VectorAdd( ray.position, rayDir );
}
return result;
}