Textures are being displayed in the wrong order - How can I fix this?

Question

Hello, we are currently working on a 2D Platformer. The Objects in the game are represented as textures on a plane with invisible bounding meshes as platforms.

We use the normal perspective camera instead of the orthographic one so we can have background objects at different z-coordinates to simulate parallax scrolling.

However there seems to be a problem with this method. In the inspector, in the game and also in the build game some objects are shown as being in front of other objects even though they are technically behind them.

Example:

alt text

The mushroom is actually 5 units behind the tree but still shown in front of it. If I move the character however:

alt text

If I'm above the mushroom it is shown correctly. Even if I place the mushroom about 20 units behind the tree it is still shown to be in front of the tree, it only gets smaller. This problem doesn't exist in orthographic projection but we would loose the parallax scrolling if we were to use that. I don't know what's causing the problem or how to fix it. Anyone got an idea?

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Answer by Piflik · Jan 03, 2013 at 01:45 PM

It is usually quite hard for an engine to get the correct render order with transparent materials, especially Alpha Blended materials. Alpha Tested materials don't have this problem AFAIK. Try a cutout shader. If that doesn't work, you can also change the render order per script.

http://docs.unity3d.com/Documentation/ScriptReference/Material-renderQueue.html

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Malygon · Jan 03, 2013 at 02:21 PM 0

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Thanks, the cutout shader seems to do the job. At least with the one mushroom. Should other problems arise I will try out the render order.

Edit: Since the cutout shader negatively impacted the quality of our textures I used the renderer order. I wrote a simple script that sorts every GameObject by its Z axis and then applies a number to the renderQueue variable.

Textures are being displayed in the wrong order - How can I fix this?

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