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Texturing a cube via glTexGen


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#1 D.Chhetri   Members   -  Reputation: 181

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Posted 13 November 2012 - 09:17 PM

void Building::_renderDefaultBuilding()const{
    glColor3f(1.0f,1.0f,1.0f);
    glTranslatef(m_position.x,m_position.y,m_position.z);
    Vector3f t = m_size / 2.0f;
    glTranslatef(t.x,t.y,-t.z); //translate so its bottom surface starts at (0,0,0)
    glScalef(m_size.x,m_size.y,m_size.z);
   
    if(!Resource::textureList.empty()){
	    glBindTexture(GL_TEXTURE_2D, Resource::textureList[Resource::NIGHT_BUILDING_TEXTURE]);
	    float s[] = {0.01f,0.0f,0.0f,0.0f};
	    float t[] = {0.0f,0.01f,0.0f,0.0f};
	    glTexGenfv(GL_S, GL_OBJECT_LINEAR, s);
	    glTexGenfv(GL_T, GL_OBJECT_LINEAR, t);
	    glEnable(GL_TEXTURE_GEN_S);		 // Auto Texture Generation
	    glEnable(GL_TEXTURE_GEN_T);
    }
    glutSolidCube(1.0f);
    glScalef(1.0f/m_size.x,1.0f/m_size.y,1.0f/m_size.z);
    glTranslatef(-t.x,-t.y,t.z);
    glTranslatef(-m_position.x, -m_position.y, -m_position.z);
}

so I have the above code, but I need help with auto generating the textures such that I can scale which part of the texture gets rendered. Any help on this?
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