Straight visible light rays with mesh light possible ?

[Hadrien_palanca]

Hi everyone,

Does anyone know how to make straight light rays with a mesh light (see picture example). I have tried cutting light with geometry or even putting noise on color channel that emit light but the atmosphere shader always seems to diffuse the light really quickly (you can see here) where I would like to have straight light rays .

I would like to have real light (not faked texture on an animated plan) and avoid doing it in post because it's really hard to have consistent rays if the light source is not directly visible. And with spot light it's a long process and need lot of light spot to follow the surface of a mesh.

Can anyone help me on that ? Maybe avoid the diffuse of the light rays on volume shader...

Thanks

[lee_griggs]

Its far from perfect, but here is a version using a spotlight. The plane has noise -> opacity.

(password: scene)

[Hadrien_palanca]

I am on C4D (unfortunately I don't have Maya) but I understand very well the process,
Thank you very much for taking the time to help me on that.
That what I was afraid of : there is no real way to do it on a mesh light, only with a spot light.
So for example if I have a moving mesh (like water) under the cube that would make rays follow the meshe's normals it won't work with a spotlight, anyway thank you I will find a way.