Hi there! I''m try to develop a set a simple modelling transforms (taper, twist, bend etc) for use on basic polyhedra via matrices. With the taper transform, I want to be able to enter a value between 0 and 1 and the object will be tapered along a set axis (let''s say the Y-axis) with the scaling proportional to the value. So a value of 0 will turn a cube into a pyramid; a value of 0.5 will taper it to half it''s x-scaling and a value of 1 will have no effect. I''ve tried modifying the taper components of the matrix directly. This tapers the object, but scales it as well so that the base is proportionally enlarged. This is not what I want. Could anyone provide me with a matrix-formula or pseudo-code to show me where I''m going wrong? If I taper an object along the y-axis, the base of the object should remain unchanged (assuming the object is at the world origin of course). Thanks! Toasted Yams are Yamtastic!