void BatchRenderer::DrawCube( const float4x4& worldMatrix, const FColor& color )
{
static const XMVECTOR verts[8] =
{
{ -1, -1, -1, 0 },
{ 1, -1, -1, 0 },
{ 1, -1, 1, 0 },
{ -1, -1, 1, 0 },
{ -1, 1, -1, 0 },
{ 1, 1, -1, 0 },
{ 1, 1, 1, 0 },
{ -1, 1, 1, 0 }
};
const UINT* edgeIndices = AABB::GetEdges();
// copy to vertex buffer
//assert( 8 <= MAX_VERTS );
XMFLOAT3 transformedVerts[8];
for( int i=0; i < 8; ++i )
{
XMVECTOR v = XMVector3Transform( verts[i], worldMatrix );
XMStoreFloat3( &transformedVerts[i], v );
}
for( int iEdge = 0; iEdge < AABB::NUM_EDGES; iEdge++ )
{
XMFLOAT3 & start = transformedVerts[ edgeIndices[iEdge*2] ];
XMFLOAT3 & end = transformedVerts[ edgeIndices[iEdge*2 + 1] ];
DrawLine3D( as_vec3(start), as_vec3(end), color, color );
}
}
bool Triangle::intersect(const Ray& r, LocalGeometry& lgeo) {
Mat4 TInv = this->transform.inverse();
Vec3 dir = as_vec3(TInv*as_vec4(r.direction));
Vec4 origin = TInv*r.origin;
if (cross(dir, normal).is_zero())
return false;
double t = dot(as_vec3(origin-A), normal)/dot(dir, normal);
if (t < 0.0)
return false;
else {
Vec4 point = origin + (as_vec4(dir) * t);
Vec3 bar_coords = barycentric_coordinates(A, B, C, point);
double alpha = bar_coords.el(0);
double beta = bar_coords.el(1);
double gamma = bar_coords.el(2);
if (alpha < 0.0 || beta < 0.0 || gamma < 0.0)
return false;
else {
lgeo.normal = submatrix(transform).inverse().transpose() * normal;
lgeo.point = transform * point;
lgeo.geo = this;
return true;
}
}
}
Color ConfigEntry::as_color() const {
if(type != ENTRY_DATA) {
printf("[ConfigEntry] Trying to read a non-string entry as color\n");
abort();
}
size_t len = split(entry_string, ",", false).size();
if(len == 3) {
return Color(as_vec3());
} else if(len == 4) {
return Color(as_vec4());
} else {
printf("A color must have 3 or 4 components: %s\n", entry_string.c_str());
abort();
return Color();
}
}
Triangle::Triangle(const Vec4& A, const Vec4& B, const Vec4& C) :
A(A), B(B), C(C) {
Vec4 AB = B-A;
Vec4 AC = C-A;
this->normal = cross(as_vec3(AB), as_vec3(AC)).normalize();
}
