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OpenGL help?


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#1
ReCuRsIoN

ReCuRsIoN

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Hi guys,

Would be great if someone could help me understand the points on openGL. FOR example

glVertex3f(1.0, 1.0, 0.5) ---- stuff like this, what determines where my origin is going to be, and how do i know how far it will move. im a little confused with this. I understand where each one is going in terms of x, y, z coordinates, but i can never get a shape going that i want, really annoying!!

Thanks. :whistling:
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#2
alansm

alansm

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glVertex commands are used within glBegin/glEnd pairs to specify point, line, and polygon vertices. The current color, normal, and texture coordinates are associated with the vertex when glVertex is called.
glBegin(GL_QUADS);

		glColor3f(1.0f, 0.0f, 0.0f);
		// FRONT
		glVertex3f(-0.5f, -0.5f,  0.5f);
		glVertex3f( 0.5f, -0.5f,  0.5f);
		glVertex3f( 0.5f,  0.5f,  0.5f);
		glVertex3f(-0.5f,  0.5f,  0.5f);
		// BACK
		glVertex3f(-0.5f, -0.5f, -0.5f);
		glVertex3f(-0.5f,  0.5f, -0.5f);
		glVertex3f( 0.5f,  0.5f, -0.5f);
		glVertex3f( 0.5f, -0.5f, -0.5f);

		glColor3f(0.0f, 1.0f, 0.0f);
		// LEFT
		glVertex3f(-0.5f, -0.5f,  0.5f);
		glVertex3f(-0.5f,  0.5f,  0.5f);
		glVertex3f(-0.5f,  0.5f, -0.5f);
		glVertex3f(-0.5f, -0.5f, -0.5f);
		// RIGHT

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