Turns out this is fucking hard. I've found a nice-seeming GL math library called GLM, but it's almost completely devoid of documentation. (No, a list of function names is not documentation.) It's not calculating the intersection point correctly, probably because I have no fucking idea what I'm doing.
Code:
typedef struct {
glm::vec4 Colour;
glm::vec3 Position;
} Vertex;
typedef struct {
std::vector<Vertex> Vtx;
glm::vec3 Normal;
} Poly;
//[...]
Vertex V1, V2, V3;
V1.Position = glm::vec3(-1.0f, -1.0f, -4.0f);
V2.Position = glm::vec3( 1.0f, 1.0f, -2.0f);
V1.Colour = glm::vec4(0.0f, 0.0f, 0.0f, 1.0f);
V2.Colour = glm::vec4(1.0f, 1.0f, 1.0f, 1.0f);
Line.Vtx.push_back(V1);
Line.Vtx.push_back(V2);
V1.Position = glm::vec3(-1.0f, 1.0f, -3.0f);
V2.Position = glm::vec3( 0.0f, -1.0f, -3.0f);
V3.Position = glm::vec3( 1.0f, 1.0f, -3.0f);
V1.Colour = glm::vec4(1.0f, 0.0f, 0.0f, 1.0f);
V2.Colour = glm::vec4(0.0f, 1.0f, 0.0f, 1.0f);
V3.Colour = glm::vec4(0.0f, 0.0f, 1.0f, 1.0f);
Tri.Vtx.push_back(V1);
Tri.Vtx.push_back(V2);
Tri.Vtx.push_back(V3);
//[...]
glm::vec3 Intersect, L0, L1, T0, T1, T2, O;
O = glm::vec3(0.0f, 0.0f, 0.0f);
T0 = Tri.Vtx[0].Position;
T1 = Tri.Vtx[1].Position;
T2 = Tri.Vtx[2].Position;
L0 = Line.Vtx[0].Position;
L1 = Line.Vtx[1].Position - Line.Vtx[0].Position;
if(glm::gtx::intersect::intersectLineTriangle<glm::vec3>
(L0, L1, T0, T1, T2, Intersect))
//[...]
Just looking at the numbers you can tell the intersection point should be (0, 0, -3), but the result is (0.5, 0.5, 0.25), which doesn't make any damn sense to me.
Firefox also needs a beating with a cluebat.
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