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PostPosted: Mon Nov 16, 2009 10:35 pm 
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Komrade
Komrade
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Joined: Tue Mar 27, 2007 6:23 pm
Posts: 1354
Location: Mario Raceway, 1509.831, 217.198, -564.429
Title: Mario Kart 64 Hacker
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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