Render Texture and Camera Normalized View port Rect Issue

Unity Engine
1

Hello,

I am working on a Ghost Effect to make smooth transitions between 2 screen states in a presentation ( object on the left then on the right ).

I use a plane resized with the frustrum of the camera.

I clone my main camera so that it can target and generate a renderTexture without messing with the main camera.

Then I wait the next frame to get a renderTexture ready and apply it on the plane. And then i “iTween” it ( FadeTo).

It works fine with a Normalized View Port Rect width set to 1. It doesn’t work at all if i use a width of 0.5 ( i have to get this effect working on 2 main cameras for 3D relief that’s why each main camera is 0.5 width ).

I get this error message :

How can I go through this ?

2

I’m sorry for resurrecting such old thread, but that issue still occurs even in latest Unity 4.3.1.

It’s 100% reproducible when using render texture with depth buffer enabled and Viewport Rect dimensions W/H on camera are less then 1.0.

Does anyone know about solid workaround? Or maybe some ETA on the fix?

3

I remember that when trying to normalize, if the value is too small to be normalized then it is set to 0.
I’m not sure how much is too small, though.

4

The best workaround I found is to let the render texture capture the entire viewport, then I modify the UV offset of the material to get only the portion of the texture needed. I capture more than I need but at least I can pass through the assert.

5

In my case it was caused by

commandBuffer.SetRenderTarget(/*doesn't matter*/, BuiltinRenderTextureType.None);

and was fixed by replacing BuiltinRenderTextureType.None by BuiltinRenderTextureType.CurrentActive

While it was None, it was spamming 3 error messages every frame with non 0;0;1;1 viewport in editor or ALWAYS in build, regardless of the resolution or fullscreen mode.