Textured rectangular light - intensity not working

[Micha]

Here I set the intensity 0, but the water pattern texture is still visible. At intensity 100 the same look.

EDIT: in CPU mode the intensity works. So, it's a GPU mode bug.

[Micha]

Found a workaround - the affect diffuse option can be used as intensity control.

[Micha]

Other problems:

* the projected texture of the rectangular lights looks pixelated (see screenshot)
* switched to CPU mode and the projected light texture isn't visible anymore

[slavcho.brusev]

Hello,

Thank you for reporting this!
This is a bug and it has been reported in our system.
I see you have found a workaround with Affect Diffuse option.
Regarding you second issue, could you please change the resize option(V-Ray Asset Editor > Settings > Render Parameters > GPU Textures > Resize) to Full-size textures.
If this does not fix the issue, could you please share a scene were the issue is reproducible so we can investigate in detail?
If this is alright, please use the Pack Project option (V-Ray > Pack Project) and send us the zip file at support@chaosgroup.com

[Micha]

Hi Slavcho,

the texture mode was at full size. Also in CPU mode the effect is visible. Interesting, if I set the texture at repeat 5 the same raw resolution is shown. Here a file for further tests. I ask me also, why the brightness of the rendering is so different in CPU and GPU mode.

And an other issue - is the filter blur of the texture working? At the texture preview is no blur effect visible and the final render doesn't show it too.

Good luck,
Micha

http://www.simulacrum.de/temp/PixelatedTexture.zip

[konstantin_chaos]

Hi Micha,

Have you tried setting the intensity with the latest stable build?
It seems to work as expected for me.

Konstantin

[Micha]

It's not working - here a screenshot at light intensity 0. Also pixelated. But is the installed build right? I updated today, but the date isn't from the current week.

[slavcho.brusev]

This occurs because the texture that emits light is rescaled for optimization purposes and in this specific case when Directionality is set to 1 this becomes visible.
This has been brought to the attention of our developers so a possible future optimization can be discussed.
Nevertheless, there is a really quick workaround that provides a decent result.
This would be to use a Blend material with Emissive material as coating and a caustics transparency texture.

To do this first add a new Blend material then add the tiles of your pool as a Base Material.
Create an Emissive material and add a black and white texture representing the caustics in the texture slot.
Add the newly created Emissive caustic material as a Coat on the blend material.
And you will now have caustics material.

I have attached an example scene: Caustics_material.zip

[Micha]

Thank you for the workaround.

I'm very curious for the future optimization since for example at the last project I need the projected pattern over different objects with different materials, also some parts shadowed by others and without pattern at the backside of the objects.

[konstantin_chaos]

A fix for the texture resolution issue will be available in the next update.