Karba: if you are able to make that change in the engine then the Vray way is by far the best practical solution (despite any ranting about biased/unbiased - which isn't relevant). It simplifies the modeling and produces perfectly accurate results.

The modeling simplification is non-trivial ...

I'm working with Thinkbox Frost and Octane is rendering the mesh just fine, but it has a viewport vs rendertime sub-d level (sort of like Turbosmooth) to minimize the viewport slowdown. Octane only renders the viewport level of detail though. Is that something that can be fixed, or are we forced to ...

The problem here is that the film buffer has only limited precision. Your scene appears to be extremely bright, causing the highlights to be clipped. Either the power of the emitters is too high, or the scene is modeled at the wrong scale.

The default exposure setting is exposure of 1, an F-stop ...

I ran another render when I went to bed. Last test render I did before that, using the preview window, looked fine. The higher res render is badly clamped again - nothing changed in the file. Current setup is in screen cap along with the greyed out result:

http://content.screencast.com/users ...

Karba wrote:This option works any way.

Not sure what this means?

Karba wrote:It is impossible to have unclamped colors with tone mapping.

I understand. So does that mean I have to choose the linear preset or just uncheck the apply tonemapping box in the rollout?

Tried it with the tonemapping applied and turned off and the renders seem to be the same to my eye. It still looks clamped, but there is not an option to turn off the tone mapping from the camera controls, so maybe it's stuck on for those renders?

I am not sure now what the default settings are, or why should these matter? I did try a few other options and (various imager settings and light power) but it seems to be rendering fine at the moment, so can't tell if it's fixed or not.

ONe correction: the camera tone-mapping was set to the Agfa preset for those two renders. I switched to linear afterwards but forgot to reset it for the screen capture. Not sure it matters.

I was using the camera settings - as per the other thread - but see that it is on in the render dialog. Does the tonemapping also clamp? Is it possible to have the tone-mapping done for the colour/contrast, but maintain the image in float?

b

I was using the camera settings (Octane camera is the render cam) but I included the f10 dialog settings too. Are those relevant?