[core][rlgl] Raycast system not working properly

[raysan5]

Raycast system intended for 3d picking is not working properly.

Related raylib example: core_3d_picking.c

Related functions [core.c][rlgl.c]:

Ray GetMouseRay(Vector2 mousePosition, Camera camera);
Vector3 rlglUnproject(Vector3 source, Matrix proj, Matrix view);

After long testing, it seems there is some error inside rlglUnproject() but not completely sure...
rlglUnproject() just resembles gluUnproject() but it doesn't work. Maybe an issue with MatrixInvert() or MatrixMultiply() order?

[raysan5]

Fixed via commit 21229aa