Okay, I''m working with OpenGL and Win32 here. I''m drawing polygons no sweat. I want to add lighting. Problem is, as soon as I do, all polygons switch to grayscale gouraud shading. I don''t think I''m doing anything terribly special; the lighting is ripped right out of Tut #7. The only difference is lack of textures (I''m using glColor3f for everything atm) but that can''t be it, can it?
Here''s my light initialization:
GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f };
GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f };
GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f };
glLightfv(GL_LIGHT0, GL_AMBIENT, LightAmbient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, LightDiffuse);
glLightfv(GL_LIGHT0, GL_POSITION, LightPosition);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHTING);
Here''s what I''m drawing (simple spinning colored pyramid):
int DrawGLScene(GLvoid)
{
static GLfloat xrot = 0;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
glLoadIdentity();
float top[][3] = {
{ 0.0, 1.0, 0.0},
{ 1.5, -1.0, -1.5},
{-1.5, -1.0, -1.5},
{-1.5, -1.0, 1.5},
{ 1.5, -1.0, 1.5}
};
float normal[][3] = {
{ 0.0, 0.0, -1.5},
{-1.5, 0.0, 0.0},
{ 0.0, 0.0, 1.5},
{ 1.5, 0.0, 0.0}
};
// begin actual drawing
glTranslatef(0.0, 0.0, -6.0); // Move Left 1.5 Units And Into The Screen 6.0
glRotatef(xrot, 1.0, 0.5, 0.3); // Rotate
glBegin(GL_TRIANGLES); // Drawing Using Triangles
glNormal3fv(normal[0]);
glColor3f(1.0, 0.0, 1.0);
glVertex3fv(top[0]);
glColor3f(0.0, 1.0, 1.0);
glVertex3fv(top[1]);
glColor3f(1.0, 1.0, 0.0);
glVertex3fv(top[2]);
glNormal3fv(normal[1]);
glColor3f(1.0, 0.0, 1.0);
glVertex3fv(top[0]);
glColor3f(1.0, 1.0, 0.0);
glVertex3fv(top[2]);
glColor3f(0.0, 1.0, 1.0);
glVertex3fv(top[3]);
glNormal3fv(normal[2]);
glColor3f(1.0, 0.0, 1.0);
glVertex3fv(top[0]);
glColor3f(0.0, 1.0, 1.0);
glVertex3fv(top[3]);
glColor3f(1.0, 1.0, 0.0);
glVertex3fv(top[4]);
glNormal3fv(normal[3]);
glColor3f(1.0, 0.0, 1.0);
glVertex3fv(top[0]);
glColor3f(1.0, 1.0, 0.0);
glVertex3fv(top[4]);
glColor3f(0.0, 1.0, 1.0);
glVertex3fv(top[1]);
glEnd(); // Finished Drawing The Triangle
// end actual drawing
xrot += 5;
return TRUE; // Everything Went OK
}
Truly, I am stumped ......
Chris Barry (crbarry at mts.net)
My Personal Programming Depot
