a well supported feature for glDrawPixels(), especially on ATIs crashes happen with it irregularly. (note; drawing float is a regular opengl 1.0 feature...). Now all scanline/part updates in renderwindow is converted to 32 bits before drawing, also the in the UV Image window only 32 bits RGBA is drawn. What is still float: drawing the final image after render in renderwindow, and drawing the Z or Alpha in renderwindow and UV image. Of course we need to test this first. :) Will await reports...