CODEWITHSUNDEEP
androidopengl-es
JavaHell
JavaHell

Reputation: 101

Android OpenGL ES 1.1 flickering

While you are promoting my Android project, I discovered a strange.

I can display the map in the ocean Android OpenGL ES 2D graphics.

So, to be used only to determine the phase order of the object, the value is reduced to about 0.0001 Z-axis.

I tried over 1000 times the size of the object In the meantime.

Then, a phenomenon depending on the zoom in / zoom out, some objects flickering occurred.

Why such problems occur??

It is the problem of the target terminal-specific this can not be resolved if?

Or is it a problem of Android OpenGL ES itself?

***More.... The photo below is what you screen shot every time the screen of the actual device.

enter image description here

***I occurs when such a phenomenon to zoom in / zoom out each time.

Upvotes: 0

Views: 642

Answers (1)

1FpGLLjZSZMx6k
1FpGLLjZSZMx6k

Reputation: 1067

I assume what you are experiencing is z-fighting: http://en.wikipedia.org/wiki/Z-fighting

This results due to the fact that your objects are too close together so that the z-buffer for certain pixels can't distinguish between which pixel is below or above the other. You have three choices now:

1) Adjust your projection, specifically adjust znear and zfar values. Read more here: http://www.opengl.org/archives/resources/faq/technical/depthbuffer.htm

2) Increase the distance between both objects

3) Since you are drawing a 2D scene, you might use orthogonal projection. In that case it might be worth not to use depth buffering at all and just draw the objects from back to front (Painters Algorithm, http://en.wikipedia.org/wiki/Painters_algorithm).

Upvotes: 2

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