niemeyer

What OpenGL code does what myobject.axes = 1 does?

xyz-axis-rendering-offon-default-0

On Apr 10, 2007, at 10:51 AM, Greg Niemeyer wrote:

> What OpenGL code does what myobject.axes = 1 does?

Here's our C code for this. The line loop stuff is used for the 

        glDisable(GL_TEXTURE_2D);

            glBegin(GL_LINE_LOOP);

            glVertex3f(i*1., 0.01, 0.01);

            glVertex3f(i*1., 0.01, -0.01);

            glVertex3f(i*1., -0.01, -0.01);

            glVertex3f(i*1., -0.01, 0.01);

            glVertex3f(0.01, i*1., 0.01);

            glVertex3f(0.01, i*1., -0.01);

            glVertex3f(-0.01, i*1., -0.01);

            glVertex3f(-0.01, i*1., 0.01);

        glVertex3f(0., 0., 4.);    

            glVertex3f(0.01, 0.01, i*1.);

            glVertex3f(0.01, -0.01, i*1.);

            glVertex3f(-0.01, -0.01, i*1.);

            glVertex3f(-0.01, 0.01, i*1.);

Here's our C code for this. The line loop stuff is used for the  
"units" along each axis.

	if (ob3d->axes)
	{
		// RGB axes utility
		glDisable(GL_LIGHTING);
		glDisable(GL_TEXTURE_2D);
		// x
		glBegin(GL_LINES);
		glColor3f(4., 0., 0.);
		glVertex3f(0., 0., 0.);
		glVertex3f(4., 0., 0.);
		glEnd();
		for (i=1;i
		{
			glBegin(GL_LINE_LOOP);
			glVertex3f(i*1., 0.01, 0.01);
			glVertex3f(i*1., 0.01, -0.01);
			glVertex3f(i*1., -0.01, -0.01);
			glVertex3f(i*1., -0.01, 0.01);
			glEnd();
		}
		// y
		glBegin(GL_LINES);
		glColor3f(0., 4., 0.);
		glVertex3f(0., 0., 0.);
		glVertex3f(0., 4., 0.);
		glEnd();
		for (i=1;i
		{
			glBegin(GL_LINE_LOOP);
			glVertex3f(0.01, i*1., 0.01);
			glVertex3f(0.01, i*1., -0.01);
			glVertex3f(-0.01, i*1., -0.01);
			glVertex3f(-0.01, i*1., 0.01);
			glEnd();
		}
		// z
		glBegin(GL_LINES);
		glColor3f(0., 0., 4.);
		glVertex3f(0., 0., 0.);
		glVertex3f(0., 0., 4.);	
		glEnd();
		for (i=1;i
		{
			glBegin(GL_LINE_LOOP);
			glVertex3f(0.01, 0.01, i*1.);
			glVertex3f(0.01, -0.01, i*1.);
			glVertex3f(-0.01, -0.01, i*1.);
			glVertex3f(-0.01, 0.01, i*1.);
			glEnd();
		}
		jit_gl_report_error("ob3d_draw_end axes");		
	}


x/y/z axis rendering off/on (default = 0)