glBegin(GL_TRIANGLE_STRIP);
glNormal3f (0, 0, 1);
glTexCoord2f(0, 0);
glVertex3f (0, 0, 0);
glTexCoord2f(0, 1);
glVertex3f (0, 1, 0);
glTexCoord2f(1, 0);
glVertex3f (1, 0, 0);
glTexCoord2f(1, 1);
glVertex3f (1, 1, 0);
glEnd();
Mapping problem in OpenGL
Author
Why doesn´t this triangle strip work?
( want to use tsrip not quadstrip)
Author
To make a triangle strip you draw the quad like a "z". Why can´t I get it to work in GL?
// 1 // 3
// 0 // 2
Alright the quad show up. But the mapping is totaly wrong:
To set u,v. right for a 1x1 size quad created with tstrip:
bottom left = 0,0
top left = 0,1
bottom left = 1,0
bottom top = 1,1
In GL it is:
bottom left = 0,1
top left = 0,0
bottom left = 1,1
bottom top = 1,0
Why this displacement?
Zeblar Nagrim, Lord of Chaos
// 1 // 3
// 0 // 2
Alright the quad show up. But the mapping is totaly wrong:
To set u,v. right for a 1x1 size quad created with tstrip:
bottom left = 0,0
top left = 0,1
bottom left = 1,0
bottom top = 1,1
In GL it is:
bottom left = 0,1
top left = 0,0
bottom left = 1,1
bottom top = 1,0
Why this displacement?
Zeblar Nagrim, Lord of Chaos
Author
I think I know the answer to my question now.
OpenGL draw primitives anti-clockwise and Direct3D the other way around.
Zeblar Nagrim, Lord of Chaos
OpenGL draw primitives anti-clockwise and Direct3D the other way around.
Zeblar Nagrim, Lord of Chaos
Your texture coords look ok to me.
GL is indeed:
(0,0) bottom left
(0, 1) top left
(1, 1) top right
(1, 0) bottom right
So that''s not the problem.
It''s been a while since I''ve used triangle strips, so this is probably wrong, but try creating the first triangle of the strip with anti-clockwise winding. You may be drawing everything upside down. Then again I get the impression that I''m talking crap :p
I''ll try it out later.
GL is indeed:
(0,0) bottom left
(0, 1) top left
(1, 1) top right
(1, 0) bottom right
So that''s not the problem.
It''s been a while since I''ve used triangle strips, so this is probably wrong, but try creating the first triangle of the strip with anti-clockwise winding. You may be drawing everything upside down. Then again I get the impression that I''m talking crap :p
I''ll try it out later.
Your texture coords look ok to me.
GL is indeed:
(0,0) bottom left
(0, 1) top left
(1, 1) top right
(1, 0) bottom right
So that''s not the problem.
It''s been a while since I''ve used triangle strips, so this is probably wrong, but try creating the first triangle of the strip with anti-clockwise winding. You may be drawing everything upside down. Then again I get the impression that I''m talking crap :p
I''ll try it out later.
GL is indeed:
(0,0) bottom left
(0, 1) top left
(1, 1) top right
(1, 0) bottom right
So that''s not the problem.
It''s been a while since I''ve used triangle strips, so this is probably wrong, but try creating the first triangle of the strip with anti-clockwise winding. You may be drawing everything upside down. Then again I get the impression that I''m talking crap :p
I''ll try it out later.
Dear mr moderator.
Please forgive my abject stupidity by forgetting to enter my username and then posting twice.
Please forgive my abject stupidity by forgetting to enter my username and then posting twice.
HAHAH LOL 
Actually it isn''t your fault totaly GDNET needs to make a login cookie for a month or year
Actually it isn''t your fault totaly
GDNET needs to make a login cookie for a month or year
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement