From: "Alberto Monteiro" <[EMAIL PROTECTED]>
> > The program is as simple as possible, and all but the first > triangle appear correctly. The first triangle, however, is invisible. > > Essentially, this is the OpenGL part of the program: > > glLoadIdentity(); > > glTranslatef(0.0f,0.0f,-15.0f); > glRotated(m_angulo, m_x, m_y, m_z); > > glBegin(GL_TRIANGLES); // Draw Triangles > > glNormal3f(1.0f, 1.0f, 1.0f); // should be the yellow face, but is > invisible > glColor3f(1.0f, 1.0f, 0.0f); > glVertex3f(1.0f, 0.0f, 0.0f); > glVertex3f(0.0f, 1.0f, 0.0f); > glVertex3f(0.0f, 0.0f, 1.0f); > > glColor3f(0.5f, 0.0f, 0.0f); > glVertex3f(0.0f, 0.0f, 0.0f); > glVertex3f(1.0f, 0.0f, 0.0f); > glVertex3f(0.0f, 1.0f, 0.0f); > > glColor3f(0.0f, 0.5f, 0.0f); > glVertex3f(0.0f, 0.0f, 0.0f); > glVertex3f(0.0f, 1.0f, 0.0f); > glVertex3f(0.0f, 0.0f, 1.0f); > > glColor3f(0.0f, 0.0f, 0.5f); > glVertex3f(0.0f, 0.0f, 0.0f); > glVertex3f(0.0f, 0.0f, 1.0f); > glVertex3f(1.0f, 0.0f, 0.0f); > > glEnd(); > glLoadIdentity(); // Reset > > The interesting thing is that, if I begin with the Red Face, > then the Yellow Face becomes visible and the Red Face > becomes invisible. > > Alberto Monteiro > I'm not familiar with OpenGL programming, but have used 3D programs and am familiar with vector mathematics. The only thing I can think of trying is to try reversing the point order on the first triangle (which should "flip" the normal vector) and see if that fixes the problem. Michael Harney [EMAIL PROTECTED] _______________________________________________ http://www.mccmedia.com/mailman/listinfo/brin-l
