[MS]

I have just got my ZBrush 4 license and I have wanted to test new tools/models attached.

I have also updated Maxwell (core and Cinema plugin) to new 2.1 version.

I have setup simple scene with one checker board plane, one cube with Half Life's Car Paint and a ZBrush model itself. For illumination I have used Physical Sky with sun enabled.

That is what I get:



As I have read that IBL is much faster then Physical Sky I have baked the sky to HDR file, changed illumination to IBL.

A that is the result:



Both images are only SL15 but as you can see, there are no caustics on IBL image.

Is it a bug or a feature? Or "known limitation of IBL"? Or did I something wrong in my setup? Or is it caused by limited bit depth of HDR image? Or?

[dariolanza]

Hello Ms,

When the emitter is very small in the hdri image (like in the case of a sun, which it only represents a few pixels), then the caustics may need much more time to appear with IBL than with Physical Sky.

Can you post an screenshot of the rendering in progress?

It would be interesting to check if those caustics appear as bright dots in the small preview window during the render.

Greetings

Dario Lanza

[MS]

Hello Dario,

here is a preview of Render region I selected from final image to see if those IBL based caustics are going to clear up...



The preview is from SL 21.

Now the rendering is at SL 22 and I can see few small bright dots in final image. But that way is much much slower then the physical sky. I will stay with Physical sky next time.

Thank you for answer.