Exclude a material from lighting pass

[Flexman]

Once in a while you want to do something exotic which bends the rules slightly.

 

Is there a material setting that will exclude an object from a lighting pass? What I want to do is have the MFD material that is the screen area not be subject to the green pointlight above it.

 

There's a 'glass' layer over the screen that shows the green point light when the layer behind the glass is showing a bright image. These attached images show the green light reflecting when the video underlay is both active and switched off. If I hide the faux glass cover it's fine.

[Josh]

The GI shader does something like this. Can't be any more specific than that, off the top of my head.

 

You could also emit black diffuse light and put all the color into the emission channel.

[Flexman]

I looked at the shaders and scratch my head for a bit then realised something I hadn't tried. Normals.

 

By adding LW_FULLBRIGHT to fix the normal on the glass plate that covers the screen it fixes the glare (and another issue relating to camera angle and the video underlay).

 

Here's the final mesh_cubemap_glass.frag shader header.

 

#define LW_DIFFUSE texture0
#define LW_CUBEMAP texture1
#define LW_FULLBRIGHT
Include "mesh.frag"

 

And the material file...

 

texture0="abstract::apache_pit_mpd_glass_skin.dds"
blend=1
depthmask=0
depthtest=1
overlay=0
zsort=1
cullface=1
castshadows=0
specular=13.50000000
gloss=0.10000000
shader="abstract::mesh_diffuse.vert","abstract::mesh_cubemap_glass.frag"

 

It does the job preventing the night lighting from obscuring the screen and it retains the cubemap reflection. So all in all quite pleased, I learned a bit more about emission and specular channels too. That might be really handy when it comes to do the infra-red night vision stuff.

[Josh]

Looks good.