Vray background sky image tiling

[sonyablade]

Hi,

 

I've difficulty with creating the realistic sky in Vray renderer during scene rendering, I've watched many videos from chaosgroup and tutorials from youtube. But it seems that I still missing the proffesional little touches from my images. If need to summarize my worklflow:

 

I use vray dome light to light the scene, and I place a cloud bitmap texture on Use Dome texture as spherical, but cloud images are getting distorted which is not realistic with scene I also played around with UV tiling values that didn't help at all as well, what other paramaters should I modify to get the realistic sky effect which also intereacts with scene objects reflectivity.

 

Regards,

[philippelamoureux]

Do you use a high quality HDRI sky image or just some random bitmap found on Google?

 

 

check out noemotionhdrs.net for free, decent HDRIs!

[sonyablade]

I use Free bitmap images randomly found on google search, low resolution images is one of the main source of discrepancy I'll have look at that from the suggested site, but aside from that I really don't understand how that dome light interacts with global Vray enviroment settings from which one sun rays are emitted if enviroment/sunlight is switched on and dome light is on.

 

Also the bacground clouds are very pale, in order to increase intensity which parameter should I manipulate? In which settings global enviroment skylight or domelight settings?

 

Regards,

Edited March 19, 2016 by sonyablade

[philippelamoureux]

You need a high quality hdri if you want your dome to light the scene properly and get interesting shadows. The best I've seen are the cg-source HDRIs. To change the brightness of your HDRI background you can adjust it's gamma!

 

This tutorial explains everything!

[sonyablade]

thank you in advance Philippe,

 

It may seem that there are many resources out there to learn the visual rendering, but actually to get creative effects it still requires the professional touches which in turn requires deliberate study and keen eye on details and many man hours to be spent on software, teh guidline is vray documentation and tutorials believe

 

Tentatively, after having hard time, I learned that light source is not simply emitted from dome light but with enviroment settings skylight, please correct me if I'm wrong, so I changed the Intensity of dome light to moderate level 6.0 and reduced the skylight intensity to 0.2 so I have more bright sky background now with resoanable illuminations of my obejct in scene, in the previous the scene was overenlighted.

 

One more final thing general for renderign philosophy, is that VRay rendering mechanism processes the pixels one by one or does it uses the shaders for that purposes, because when I compare the rendering results with unreal engine I see the big difference in terms of speed and quality, Unreal engine is by far the leading of all when compared with SU, blender, 3DSMax ,etc.. . Can you shed some light on that ?

 

Regards,