OpenGL render strangeness

@sam_mcelhinney wrote:

Hello,

I am rendering a load of points via an OpenCL VBO but the image is coming out oddly. Code is as follows:

ofEnableDepthTest();
ofEnableBlendMode(OF_BLENDMODE_ALPHA);

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);

glBindBufferARB(GL_ARRAY_BUFFER_ARB, vbo);
glVertexPointer(3, GL_FLOAT, sizeof( float4 ), 0);

glBindBufferARB(GL_ARRAY_BUFFER_ARB, cbo);
glColorPointer(4, GL_FLOAT, 0, 0);

glPointSize(1);
glDrawArrays(GL_POINTS, 0, counter);

glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
glDisableClientState(GL_COLOR_ARRAY);
glPopMatrix();
ofEnableAlphaBlending();

Where the alpha blending of the points is set at 0.1. The images below are meant to show one cloudy disk, but half of the points appear to be occluded in some way and there is a plane appearing also.

Screen Shot 2015-07-30 at 08.28.50.png2880x1800 484 KB

Screen Shot 2015-07-30 at 08.29.02.png2880x1800 465 KB

Screen Shot 2015-07-30 at 08.28.56.png2880x1800 459 KB

How can I fix the occlusion issues in the output image?

Posts: 1

Participants: 1

Read full topic