public Matrix4f SetToLookAt(Vector3f pos, Vector3f target, Vector3f up)
{
this.SetToIdentity();
tempVec.Set(target);
tempVec.SubtractStore(pos);
tempVec2.Set(pos);
tempVec2.MultiplyStore(-1);
tmpMat.SetToTranslation(tempVec2);
tmpMat2.SetToLookAt(tempVec, up);
this.Set(tmpMat);
this.MultiplyStore(tmpMat2);
return(this);
}
public static void CalculateTangents(List<Vertex> vertices, List<int> indices)
{
for (int i = 0; i < indices.Count; i += 3)
{
try
{
Vertex v0 = vertices[indices[i]];
Vertex v1 = vertices[indices[i + 1]];
Vertex v2 = vertices[indices[i + 2]];
Vector2f uv0 = v0.GetTexCoord0();
Vector2f uv1 = v1.GetTexCoord0();
Vector2f uv2 = v2.GetTexCoord0();
Vector3f edge1 = v1.GetPosition().Subtract(v0.GetPosition());
Vector3f edge2 = v2.GetPosition().Subtract(v0.GetPosition());
Vector2f edge1uv = uv1.Subtract(uv0);
Vector2f edge2uv = uv2.Subtract(uv0);
float cp = edge1uv.y * edge2uv.x - edge1uv.x * edge2uv.y;
if (cp != 0.0f)
{
float mul = 1.0f / cp;
Vector3f tangent = new Vector3f().Set(edge1.Multiply(-edge2uv.y).AddStore(edge2.Multiply(edge1uv.y)));
tangent.MultiplyStore(mul);
Vector3f bitangent = new Vector3f().Set(edge1.Multiply(-edge2uv.x).AddStore(edge2.Multiply(edge1uv.x)));
bitangent.MultiplyStore(mul);
tangent.NormalizeStore();
bitangent.NormalizeStore();
v0.SetTangent(tangent);
v1.SetTangent(tangent);
v2.SetTangent(tangent);
v0.SetBitangent(bitangent);
v1.SetBitangent(bitangent);
v2.SetBitangent(bitangent);
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
public Vector3f Unproject(float mouseX, float mouseY)
{
Vector3f vec = new Vector3f();
vec.x = -2f * (mouseX / width);
vec.y = 2f * (mouseY / height);
vec.z = 0f;
vec.MultiplyStore(projMatrix.Invert());
vec.MultiplyStore(viewMatrix.Invert());
vec.SubtractStore(Translation);
return vec;
}
