🔒 Locked

Texture mapping problems

Started by Kamikaze Nov 21, 2000 at 12:41 PM 0 replies 200+ views

Original Post

Nov 21, 2000 at 12:41 PM

Hi, making a 3D-engine and have some problems with the texture mapping. So far there is no perspective correction. Okey, to the problem: If I draw 2 polygons side by side forming a square, it's correct like this. (Sorry for the ugly texture

) But if I put the upper corners a little together the whole texture gets a wierd result like this. The vertical lines "turns" where the two polygons meet. Why? (Not the little line at the top) Please help!

Edited by - Kamikaze on 11/21/00 1:58:16 PM

errand

Nov 24, 2000 at 7:25 AM

It seems to me that what you do is you have the same z-value for all 4 corners and just adjust the x value for the top. This make the texture get weird. If you look at the top triangle you will see that the texture follows the left-side of the triangle (parallell) and the bottom triangle will have the texture following the rightside.

The x-x distance and y-y distance can''t be changed if you want to get a "perfect" texture mapping. You have to change the z-value (z+ for top, or z- for bottom coords if you use a left-handed system like DirectX or vice verse if you use OpenGL which is a righthanded system).

Hope this helps.
Other wise send me a mail and I will try to explain it in Swedish =).

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.