Function IntersectRayTriangle

src/engine/editor/EditorMath.cpp:217–248

}

bool IntersectRayTriangle(const Ray& ray, const Triangle& tri, float& t) {
    constexpr float EPSILON = 1e-6f;

    // Adjust the triangle vertices by the object's position
    FVector v0 = tri.v0;
    FVector v1 = tri.v1;
    FVector v2 = tri.v2;

    FVector edge1 = v1 - v0;
    FVector edge2 = v2 - v0;
    FVector h = ray.Direction.Cross(edge2);
    float a = edge1.Dot(h);

    if (std::abs(a) < EPSILON)
        return false; // Ray is parallel to triangle

    float f = 1.0f / a;
    FVector s = ray.Origin - v0;
    float u = f * s.Dot(h);

    if (u < 0.0f || u > 1.0f)
        return false;

    FVector q = s.Cross(edge1);
    float v = f * ray.Direction.Dot(q);

    if (v < 0.0f || u + v > 1.0f)
        return false;

    t = f * edge2.Dot(q);
    return t > EPSILON;
}

bool IntersectRayTriangleAndTransform(const Ray& ray, FVector pos, const Triangle& tri, float& t) {
    constexpr float EPSILON = 1e-6f;