HDRI trouble, how to get HDRI´s work right?

[djart]

Hello,

for a current project i decided to use octane for outdoor architcture animation.
I did some tests with the free HDRI set from Vizpeople and they work fine, more or less.
See imagenumber 1

But the hdri is mostly overexposed. to get rid of it, i put a colorshader in(for brighness etc. control)
, with gives me the wanted result, but it causes heavy fireflies. This is PROBLEM ONE
See imagenumber 2

Problem two is, if i use some other HDRI´s from Vizpark as for example, i get a totally unusable and uncontrollable overexposed image
See imagenumber 3

I use version 1,13, cause it runs very stable.

What can i do to get hdri´s work right/ get rid of the fireflies or overexposed images?

Any help is appreciated.

[djart]

Its funny that sometimes the solution lays so close to the problem.

I just did the old "Sun Daylight + HDR workaround" trick, using a big sphere of 600000cm and put the HDR into the diffuse channel. Opacity is set to 50. Now i can use the colorcorr. shader for the HDR without any problem
to get rid of any overexposed look.

cheers,
djart

[roeland]

The problem is often that the gamma value of the image is still set to 2.2. For HDR images it should be set to 1.0.

--
Roeland

[djart]

Hello roeland,

thx for your help. Changing gamma value works for some HDR´s but others i just cant get to work right.
The overexpose is so heavy, that i would need - values for gamma, power etc.
Maybe the Dynamic Range of the HDR´s is to big?

The best solution for me now is to use a daylight, put the HDR´s onto a sphere, opacity to 50% and use colorcorr. in diffusechannel for controlling the HDR.

cheers,
djart

[aoktar]

your hdrs maybe not so good.

[djart]

your hdrs maybe not so good.

I guess these should work fine http://www.vizpark.com/product-category/hdri/ http://www.viz-people.com/online-store/ ... -87/ctx-22
Theres no problems using them with Vray or AR3/ Physical.