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overlapping polygons

General and Gameplay Programming Programming

Started by paulbird July 28, 2005 12:13 PM

0 comments, last by SiCrane 18 years, 8 months ago

paulbird

182

Author

July 28, 2005 12:13 PM

Do you know any Win32 graphics modes/functions that enable you to do this: When you draw 2 polygons of a light shade, where they overlap they are coloured a darker shade?

Acid Frog Games

SiCrane

11,840

July 28, 2005 12:18 PM

Assuming you mean GDI functions, you can use AlphaBlend() to blit the polygons as raster images so that when they overlap the alphas add to a darker shade. You can probably get a similar effect with BitBlt() with the SRCAND raster op, though thats more hackish.