[SOLVED] Draw order of sprites with a perspective camera

Questions
1

Hello!

I can reproduce this issue with a simple defold perspective camera, as well as with the rendercam library.
Just switch between the ‘/main/perspective.render’ and ‘/rendercam/rendercam.render’

Sample project: github

The red sprite can be moved with the arrow keys and as soon as it crosses the middle/green line the sprite disappears. it seems like this only occurs when looking at an angle on the objects.

Any ideas how this problem could be solved?

Thanks in advance

2

I haven’t tested your project but isn’t this a problem with the near and far plane and the sprite or sections of it being outside of the planes?

3

Both sprites are inside the configured near Z/far Z values

Without any knowledge of the system here, It looks like that the distance between the camera and the center of a sprite is used to determine a draw order.

This might be a problem with a combination of very small/large sprites (32x32 and 1024x1024 in this case) or if rotations are used a lot.

So while the red sprite should be on top of the big one, it gets rendered after (and is completely overdrawn in this case)

4

Well, that happens when there is no prior knowledge of OpenGL.
Found a topic that exactly desrcibes the same problem - but with a solution :slight_smile:

(and transparency also works)

Marked as solved.

5

Excellent!