hdri vs whitout

[Daniel79]

This render i try to use an hdri image but the noise istoo much..
The same render whitout hdri in onli few second is clean..
Where i wrong??

There are a setting wrong about pathtracing option??

Please help me to obtain a clean image..please!!!

[Daniel79]

ther's not anyone can help me?

[Sam]

HDRI goes like this
The more blurry it is the less artefacts you get

Try that, open the HDR file in Photoshop, do a small gaussian blur, save the HDR with the hdrname_blurred.hdr
Reload the blurred HDR in Octane, try to render and compare the two renders.

[Daniel79]

I don't understand very well..

The noise due to hdri?
If i do a small gaussian blur in final image i have a clean image?

Thanks

[radiance]

Hi,

The higher amount of noise is due to bright areas on the HDRI map.
A small amount of reflected rays find these bright spots,
giving more variance/bright contributions.

The solution is to let it render a little bit longer.

I need to develop more advanced algorithms in the near future that make situations like this less noisy.

Radiance

[Daniel79]

thanks to all
i try to do what you say me..

I forgot to say i used demo v0.7

[samartin]

If you can, try and apply a Gaussian filter the HDR map you want to use. This should theoretically smooth out those problem spots!

This is a trick I used to use in LW, processing options which meant I didn't have to destroy or make a new HDR

[Stereomike]

@Radiance: Would be neat to have an option to blur and to edit the hdr-range (clip) of the background image inside of octane. This will help tweaking rendertimes.

[radiance]

i could add a button to clip it, but clip where ?
it depends on the average intensity i guess...

i'll think about it.

EDIT: one thing to remember is that when MLT is available all these issues are suddenly less important.

Radiance

[samartin]

I quickly knocked up a preview showing a normal HDR image vs Gaussian HDR image.

Having controls would be great, but I'm sure you have tonnes on as it is...