OTOY Forums

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.

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

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

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

your hdrs maybe not so good.

aoktar wrote: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.