Overexposure in external renderers

I have tried rendering some scenes in Virtualight and Povray after exporting from Blender. In both cases the images get heavily overexposed, so I have to turn down the lights very much. can someone else confirm this? Have you found any general rules about how to set the “energy” compared to when you render in Blender itself? Also, would it be possible to use some kind of global light reduction in the export scripts?

It is rather a material problem. Too much reflection.

It is rather a material problem. Too much reflection.[/quote]

Finally:

Hanspb

…regarding the Povanim export, take a look at the mat(yourfilename).inc file. You should see material declerations in that file (which is created once the export is run). One of them will be reflection. On export it is set to 1.0 for all objects. Play with that number to remove some of the over ‘exposure’. You can edit in Povray or notepad. You’ll also need to adjust some of the other settings, and adjust you lights as you already have done before. God luck. Hope this helps a bit.

Sorry, but now, in the last version, it is exactly reversed and, by default, there is no reflexion . You have to set the reflexion value “by hand” in the material.mirR, 1.0==0.0 reflexion, 0.0 == 1.0 reflexion.

With no reflexion, the globlal light sets to 0.45
(http://jmsoler.free.fr/util/blenderfile/images/GUI/light2/globallight01.jpg)
and no changement in the included file of materials:

Rendered in Blender :
http://jmsoler.free.fr/util/blenderfile/images/povraytextures/mesh2blendernorm2.jpg
Rendered in povray:
http://jmsoler.free.fr/util/blenderfile/images/povraytextures/mesh2povraynorm.jpg

Regards,

No need to be sorry! Always good news when scripts are updated. Thanks jms! I’m sorry for not knowing that myself.

Any chance you can help out with UV bump mapping? I still have yet to really figure it out.

Is there a way to set up UV bumping upon export? If not, do you (or anyone reading) know how to apply the UV mapped image as a bump using Povay’s scripting language?

Thanks in advance.

There is a way to add a bump_map.

1/ this only works with uvmapped texture.
2/ you have to connect the bump_map using the extra material of povanim
3/ … hum, it is a bit longer

I am going to make a step by step page within the afternoon (european time).

Regards

Jms,

Thanks for the reply. I’m looking forward to it.

Is this the version for Blender 2.26? I haven’t tried that one yet.

Exactly, but also available in the actual povanim225h-05

So look at this address from time to time:

Beautiful! I will have to try this out tonight at home. Looks promising.
You should post a new thread so others can see it. Thanks so much.

jms,

is there any way you can post the blend file from your bump_map tutorial for download? I think seeing it might help me to get this to work.

http://jmsoler.free.fr/util/blenderfile/povanim226_02.zip
Try the new “Auto Bump_map” button in the Material window.
Shorter and more intuitive ( I hope).