Quads facing at the camera
Author
Any tutorial somewhere where is explained how to make quads, triangles, polygons, whatever always facing at the camera?
Or if someone can help me with this.
-- YartZ
You can try this http://nate.scuzzy.net/docs/billboard/ and this http://nate.scuzzy.net/gltut/billboard.zip.
I recently wrote a class that uses the code from nate''s tutorial. I can send it to you, just drop me an e-mail, or you can check out nate''s source.
HHSDrum@yahoo.com
Polarisoft Home Page
HHSDrum@yahoo.com
Polarisoft Home Page
Call this just before you draw the quad:
void Billboard(void){ float temp[16]={ 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }, m[16]; glGetFloatv(GL_MODELVIEW_MATRIX, m); temp[0]=matrix[0]; temp[1]=matrix[4]; temp[2]=matrix[8]; temp[4]=matrix[1]; temp[5]=matrix[5]; temp[6]=matrix[9]; temp[8]=matrix[2]; temp[9]=matrix[6]; temp[10]=matrix[10]; glMultMatrixf(temp);}
ya, that''s basically what my code does, just inverts the modelview matrix.
HHSDrum@yahoo.com
Polarisoft Home Page
HHSDrum@yahoo.com
Polarisoft Home Page
Is that faster than:
glGetFloatv(GL_MODELVIEW_MATRIX,m);
glLoadIdentity();
glTranslatef(m[12],m[13],m[14]);
?
Or do they do different things?
I do a LOT of these in my game, so maybe I''ll go ahead and try the other method to see if I can get a speed improvement...
glGetFloatv(GL_MODELVIEW_MATRIX,m);
glLoadIdentity();
glTranslatef(m[12],m[13],m[14]);
?
Or do they do different things?
I do a LOT of these in my game, so maybe I''ll go ahead and try the other method to see if I can get a speed improvement...
I''m not sure that the elements you are changing are correct. I''m not at home now, so I can''t check, but nate inverts in one line like that in his code. to can check his code.
HHSDrum@yahoo.com
Polarisoft Home Page
HHSDrum@yahoo.com
Polarisoft Home Page
i have been messing with a program for a long time & cant seem to see the problem . the blue book thingy i downloaded from the www doesnt explain what the APIs do in realistic terms so im not sure what i am doing . i want to make 3D objects from 2D polygons using the maximum amount so the objects can be taken apart . i want the polygons to always face forwards but the objects have to rotate etc. . i want to make a loop so i dont have to rewrite the gltranslate x,y,z etc. more than once . i want it to be taken care of so all i have to do is program like i am using DMA with algebra,trig,logic in masm32 with formulas .
is that @ all possible ? what is , what isint ?
> steverowe5@aol.com or hotmail
are there any more explanitory examples of these APIs ?
i am a programmer only when there is documentation that is defined or with definitions .
is that @ all possible ? what is , what isint ?
> steverowe5@aol.com or hotmail
are there any more explanitory examples of these APIs ?
i am a programmer only when there is documentation that is defined or with definitions .
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