LuxCoreRender Forums

Hey guys. we are integrating luxcore into our own 3D application, and we met a problem with changing the background for our archviz scene.
we are using HDRI IBL for lighting the scene. here is what we got in the render. as you can see, the HDRI image can be seen from the window, which may not look pleasant and not predictable. so we are considering changing the background for the render.
what we are going to do is to add a skydome, and put a png background inside the skydome, since we are enabling single side rendering. the skydome won't affect the lighting. but we could see the background from inside, which should perfectly solve our problem, hopefully.
the problem, for now, is the skydome looks dark in the scene. so I was wondering if there were any material that can make the png image not affected by the lighting in the scene. or are there any configs that could help this work? or something like shaderless like blender did with cycle.
besides, any other suggestions on how to achieve the goal would be appreciated.
thanks in advance!

richardbao wrote: ↑Wed May 12, 2021 2:54 am any other suggestions on how to achieve the goal would be appreciated.

You can enable Alpha channel and use BACKGROUND_IMG plugin to replace the back ground (all pixels where rays hit nothing with any image you want) like in this example: https://github.com/LuxCoreRender/LuxCor ... ackimg.cfg
It should do exactly what you are looking for.

Thanks Dade, I'll try this.
and for the shaderless material, will there any plan for including that?

richardbao wrote: ↑Thu May 13, 2021 6:19 am and for the shaderless material, will there any plan for including that?

Not for the moment but you have holdout and Object ID AOV for any kind of specific post-processing, you may need, of pixels covered by an object.