Creating HDRIs with Terragen and VRAY

General discussion on V-Ray for SketchUp

Creating HDRIs with Terragen and VRAY

Postby AcesHigh » Thu Apr 16, 2009 9:34 pm

Gosh, I ask too many questions... but here is one more... Ive tried producing HDRIs with Terragen. The end result, imagewise, is awesome... perfect to use as background image (360º hor and vert pano)... the problem comes with the HDRI part itself!

while on HDRI programs, the image seems to behave perfectly as for exposure, but when I use it as GI in VRAY, not only it barely illuminates anything, as it creates some very weird ULTRA BRIGHT PIXELATED SPOTS all over the place! Does anyone has any idea why this happens?
0

AcesHigh 
 

Re: Creating HDRIs with Terragen and VRAY

Postby thomthom » Thu Apr 16, 2009 9:53 pm

Screenshots?
0
Thomas Thomassen — SketchUp Monkey & Coding addict
List of my plugins and link to the CookieWare fund
User avatar
thomthom 
PluginStore Author
PluginStore Author
 

Re: Creating HDRIs with Terragen and VRAY

Postby thomthom » Thu Apr 16, 2009 9:54 pm

Often you want to sample down and blur the HDR you use for GI lighting to avoid artefacts.
0
Thomas Thomassen — SketchUp Monkey & Coding addict
List of my plugins and link to the CookieWare fund
User avatar
thomthom 
PluginStore Author
PluginStore Author
 

Re: Creating HDRIs with Terragen and VRAY

Postby AcesHigh » Thu Apr 16, 2009 10:01 pm

thomthom wrote:Screenshots?


01
from the ground


02
from above, but close


03
from above, very far away (cant even see the ball anymore. Notice the artifacts pattern REMAIN THE SAME, its constant, no matter the distance!!!!
0

AcesHigh 
 

Re: Creating HDRIs with Terragen and VRAY

Postby thomthom » Thu Apr 16, 2009 10:05 pm

Odd. Try blurring the GI HDR you use? Don't have to do anything to the Background HDR though.
0
Thomas Thomassen — SketchUp Monkey & Coding addict
List of my plugins and link to the CookieWare fund
User avatar
thomthom 
PluginStore Author
PluginStore Author
 

Re: Creating HDRIs with Terragen and VRAY

Postby AcesHigh » Thu Apr 16, 2009 10:10 pm

thomthom wrote:Odd. Try blurring the GI HDR you use? Don't have to do anything to the Background HDR though.


blurred it to 50. Nothing changed.

I was mistaken. Setting the bitmap multiplier at 50 brightened up the image, but the artifacts persisted.
0

AcesHigh 
 

Re: Creating HDRIs with Terragen and VRAY

Postby thomthom » Thu Apr 16, 2009 10:12 pm

Might be that Terragen has generated some extra bright pixels...
0
Thomas Thomassen — SketchUp Monkey & Coding addict
List of my plugins and link to the CookieWare fund
User avatar
thomthom 
PluginStore Author
PluginStore Author
 

Re: Creating HDRIs with Terragen and VRAY

Postby remus » Thu Apr 16, 2009 10:14 pm

You could try the HDR in another app to see if its an issue with vray or with the HDR itself :thumb:
0

remus 
 

Re: Creating HDRIs with Terragen and VRAY

Postby AcesHigh » Thu Apr 16, 2009 10:24 pm

thomthom wrote:Might be that Terragen has generated some extra bright pixels...


I wonder why they dont show up in the image when viewing it at HDRShop or Photoshop. It only happens in VRAY. I followed some tutorials on the net to make the HDRs... neither mentioned it, but neither mentioned VRAY either :)
0

AcesHigh 
 

Re: Creating HDRIs with Terragen and VRAY

Postby AcesHigh » Thu Apr 16, 2009 10:25 pm

remus wrote:You could try the HDR in another app to see if its an issue with vray or with the HDR itself :thumb:


do you have any suggestion of app for me to try it?
0

AcesHigh 
 

Re: Creating HDRIs with Terragen and VRAY

Postby thomthom » Thu Apr 16, 2009 10:29 pm

AcesHigh wrote:
thomthom wrote:Might be that Terragen has generated some extra bright pixels...


I wonder why they dont show up in the image when viewing it at HDRShop or Photoshop. It only happens in VRAY. I followed some tutorials on the net to make the HDRs... neither mentioned it, but neither mentioned VRAY either :)

Would be that it's just a single pixel. And Photoshop should only display certain colour range, but V-Ray uses the whole range to calculate the light.
0
Thomas Thomassen — SketchUp Monkey & Coding addict
List of my plugins and link to the CookieWare fund
User avatar
thomthom 
PluginStore Author
PluginStore Author
 

Re: Creating HDRIs with Terragen and VRAY

Postby remus » Thu Apr 16, 2009 10:31 pm

Kerkythea is the first one that springs to mind. Indigo might be able to do it, but youd have to convert to .exr first, which might do weird things.
0

remus 
 

Re: Creating HDRIs with Terragen and VRAY

Postby sepo » Thu Apr 16, 2009 10:40 pm

Also try in LightUp...
0

sepo 
 

Re: Creating HDRIs with Terragen and VRAY

Postby AcesHigh » Thu Apr 16, 2009 11:15 pm

sepo wrote:Also try in LightUp...


tried in Lightup... no artifact appeared, but I suppose Lightup dont really uses HDRI images... I mean... it works the same for .HDR or .JPG images!
0

AcesHigh 
 

SketchUcation One-Liner Adverts

by Ad Machine » 5 minutes ago



Ad Machine 
Robot
 



 

Return to V-Ray

Who is online

Users browsing this forum: No registered users and 1 guest

Visit our sponsors: