UV Mapping

Jake

Member

Posts: 508
Joined: 2002.05

Post: #1

Aug 13, 2003 — 10:49 AM

Right now I have a height map for my game, and i am trying to take the X and Z coordinates and turn them into UV cordiates.

Here is the picture of what i am currently getting

[Image: uv.jpg]

Here is the code that makes the UV and then renders them.

I don't see why its not working correcly, I did some of the math out by hand and it should have worked...

Also, X,Y,Z are floats, U,V are GLfloats, I have tried a few combinations of variable types.

PHP Code:

- (void) makeUVCoordinates
{
    int i,j;
    float textureSizes[5];
    
    textureSizes[0] = 4;
    textureSizes[1] = 2;
    textureSizes[2] = 1;
    textureSizes[3] = 1;
    textureSizes[4] = 4;
    
    for( i = 0; i < levelx*levely*2; i++ )
    {
        for ( j = 0; j < 3; j++)
        {    
            triangles[i].vertex[j].u = triangles[i].vertex[j].x / textureSizes[triangles[i].t];
            triangles[i].vertex[j].v = triangles[i].vertex[j].z / textureSizes[triangles[i].t];
        }
    }
}

- (void) renderLevel
{
    int i,j;
    
    glView* gv = (glView*)[self superview];

    for( i = 0; i < levelx*levely*2; i++ )
    {
        
        glBindTexture( GL_TEXTURE_2D, gv->texture[triangles[i].t] ); 

        glBegin( GL_TRIANGLES );             // Draw a triangle
        
        for ( j = 0; j < 3; j++)
        {    
            glVertex3f(   triangles[i].vertex[j].x, triangles[i].vertex[j].y, triangles[i].vertex[j].z ); 
            glTexCoord2f( triangles[i].vertex[j].u, triangles[i].vertex[j].v );
        }
        
        glEnd();    
    }

} 

Nuclear Nova Software, iOS and Mac Games

Fenris

Oldtimer

Posts: 832
Joined: 2002.09

Post: #2

Aug 13, 2003 — 01:41 PM

I would _really_ recommend you to call glTexCoord2f before glVertex3f - as you do it now, each vertex gets the texcoords of the next vertex. This should produce what you're seeing.