3D draw colors bleed into 2D draw colors

Shawn Andrews · 2013-04-30T21:23:25

When I draw things in 3D perspective, which contains green lighting, it bleeds into my 2D ortho drawings. In this picture, I draw my 3d scene on the large left-side viewport, and draw my 2d scene on the smaller right-side viewport(which contains a 2d red triangle): (you can see the full red triangle has been tainted with green colors from previous 3d drawings) This is my drawing structure: //start 3d drawing glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glViewport(0, 0, windowWidth/1.3, windowHeight); glClearColor(0,0.5,0.5,0); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(60.0, (float)windowWidth / (float)windowHeight, 0.4, 9000.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glEnable(GL_DEPTH_TEST); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_NORMALIZE); glEnable(GL_COLOR_MATERIAL); //draw 3d primitives + model and view transforms //2D drawing glClear(GL_DEPTH_BUFFER_BIT); glViewport(windowWidth/1.3, 0, windowWidth, windowHeight); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0.0f, windowWidth, windowHeight, 0.0f, 0.0f, 1.0f); glDisable(GL_DEPTH_TEST); glDisable(GL_CULL_FACE); glDisable(GL_TEXTURE_2D); glDisable(GL_LIGHTING); //draw red triangle glPushMatrix(); glColor3f(1.0f, 0.0f, 0.0f); glBegin(GL_TRIANGLES); glVertex3f(0.0f, 0.0f, 0.0f); glVertex3f(20.0f, 20.0f, 0.0f); glVertex3f(70.0f, 20.0f, 0.0f); glEnd(); glPopMatrix(); //swap buffers glutSwapBuffers();

Graphics and GPU Programming Programming

Started by Shawn619 April 30, 2013 01:49 AM

10 comments, last by Shawn619 10 years, 11 months ago

SuperVGA

1,303

April 30, 2013 09:12 PM

Yes you can. :)
I've only done it once, but this article explains what you want to do:
http://www.opengl.org/sdk/docs/tutorials/ClockworkCoders/lighting.php

It's only the output that you cut off. Some shader versions require explicit declaration of the valid inputs however, so you may have to write that too, somewhere.