View Full Version : KIL in VP?

06-12-2003, 05:46 PM
hi guys,
first of all please let me say thanks for the answers you have provided to my previous post, i dont know why but i just couldnt reply to the post (got some jscript error)

i got one more question about vp, is there any way i can kill a vertex in a vertex program?
i mean, i just wish i could flip normals in vertex progs to kill some vertices
is this possible?

as usual, many thanks

EDIT: i still cant reply to posts, is it my problem or what? anyway urgh thanks a lot cass http://www.opengl.org/discussion_boards/ubb/smile.gif

[This message has been edited by tellaman (edited 06-12-2003).]

06-12-2003, 05:54 PM
No. This is not possible today.

Killing happens per-primitive or per-fragment only.

06-12-2003, 07:10 PM
You can send in a texture coordinate, and use KIL in the fragment program if the coordinate is less than 0.

Note, that the coordinate will be interpolated across triangles, so if you want a specific triangle gone, you need to kill all three vertices (and that might kill parts of other things that share those vertices).

06-12-2003, 07:21 PM
So far ever since the GeForce 3, you can not create or detroy a vertex in the GPU using a vertex program/shader. Maybe in the future this will change.