void TextureProjection::fitTexture (std::size_t width, std::size_t height, const Vector3& normal, const Winding& w,
float s_repeat, float t_repeat)
{
if (w.size() < 3) {
return;
}
Matrix4 st2tex = m_texdef.getTransform((float) width, (float) height);
// the current texture transform
Matrix4 local2tex = st2tex;
{
Matrix4 xyz2st;
basisForNormal(normal, xyz2st);
matrix4_multiply_by_matrix4(local2tex, xyz2st);
}
// the bounds of the current texture transform
AABB bounds;
for (Winding::const_iterator i = w.begin(); i != w.end(); ++i) {
Vector3 texcoord = matrix4_transformed_point(local2tex, (*i).vertex);
aabb_extend_by_point_safe(bounds, texcoord);
}
bounds.origin.z() = 0;
bounds.extents.z() = 1;
// the bounds of a perfectly fitted texture transform
AABB perfect(Vector3(s_repeat * 0.5, t_repeat * 0.5, 0), Vector3(s_repeat * 0.5, t_repeat * 0.5, 1));
// the difference between the current texture transform and the perfectly fitted transform
Matrix4 matrix(Matrix4::getTranslation(bounds.origin - perfect.origin));
matrix4_pivoted_scale_by_vec3(matrix, bounds.extents / perfect.extents, perfect.origin);
matrix4_affine_invert(matrix);
// apply the difference to the current texture transform
matrix4_premultiply_by_matrix4(st2tex, matrix);
setTransform((float) width, (float) height, st2tex);
m_texdef.normalise((float) width, (float) height);
}
void operator()(const Vector3& point) const
{
aabb_extend_by_point_safe(m_bounds, point);
}
