I’ve tried to reproduce your distorted views and the only instance whre the box seemed distorted was, when I disabled the Depth Buffer of the Renderer. attached is an example.
If this doesn’t solve your problem, please attach your patch and I’ll have a look.
About the constant node: it’s like the DrawFixed Node just as .fx shader. The only thing, the constant node does is to color every pixel of a surface with a specified color regardless of any light.