Pro OpenGL ES for iOS

198 CHAPTER 6: Will It Blend?^

glColorPointer(4, GL_UNSIGNED_BYTE, 0, m_ColorData);

[self multiTextureBumpMap:m_BumpMapInfo.name tex1:m_TextureInfo.name];

glDrawArrays(GL_TRIANGLE_STRIP, 0, (m_Slices+1)*2*(m_Stacks-1)+2);

return true;

}

Make sure to copy over multiTextureBumpMap() from the previous exercise to Planet.m.

Now go to where you initialize the lights in your solar-system controller, and comment

out the call to create the specular material. Bump mapping and specular reflections

don’t get along too well.

And to your solar-system’s controller replace its current execute() and executePlanet()

methods with listing 6-9. This dumps the sun, moves the earth into the center of things,

and places the main light off to the left.

Listing 6-9. The New Execute Routine that Places the Earth in the Center

-(void)execute

{

GLfloat posFill1[]={-8.0,0.0,5.0,1.0};

GLfloat cyan[]={0.0,1.0,1.0,1.0};

static GLfloat angle=0.0;

GLfloat orbitalIncrement=.5;

GLfloat sunPos[4]={0.0,0.0,0.0,1.0};

glLightfv(SS_FILLLIGHT1,GL_POSITION,posFill1);

glEnable(GL_DEPTH_TEST);

glClearColor(0.0, 0.25f, 0.35f, 1.0);

glClear(GL_COLOR_BUFFER_BIT);

glPushMatrix();

glTranslatef(-m_Eyeposition[X_VALUE],-m_Eyeposition[Y_VALUE],-

m_Eyeposition[Z_VALUE]);

glLightfv(SS_SUNLIGHT,GL_POSITION,sunPos);

glEnable(SS_FILLLIGHT1);

glDisable(SS_FILLLIGHT2);

glPushMatrix();

angle+=orbitalIncrement;

[self executePlanet:m_Earth];

glPopMatrix();

glPopMatrix();

}