illumination on renderings

[dheersreedh]

Hi

 

Now a days I am facing a problem with my renderings in MAX with Vray..

 

I am attaching the view here...

 

Anybody can help me just paste opinions please...

 

 

Regards...

 

Sudheer

[Chris MacDonald]

That's definitely caused by your GI solution. Try these, one at a time (not all at once!) until you find the one that works best:

 

1) Turning on detail enhancement in the irradiance map - this puts more samples in areas of fine detail and often resolves problems without drastically increasing your precalc times.

 

2) Turn up the hemispherical subdivisions on the irradiance map.

 

3) If this still doesn't work, try turning up the interpolation; this will result in a slightly less accurate GI solution, but it will be a lot smoother.

 

4) Increase your light cache samples/subdivs.

[Ciro Sannino]

Hi,

I agree with Chris in points 2-3-4!

I just suggest you to try also "raytrace" in light cache

Increase render time, but it can avoid such artfacts

 

Good luck

[unrinoceronte]

Ciro, nice to see you posting here!...

 

Sudheer: have you tried also selecting SUB PIXEL MAPPING and CLAMP OUTPUT on the COLOR MAPPING TAB? . It helps me some times with those white artifacts or splotches..

 

By the way, if one of you guys know what exactly this two parameters do (subpix mapping and clamp output) could you let me know? I just know that when i turn them on i stop getting these kind of small white artifacts, but i am not sure if somehow doing this is making something else to my render, or perhaps something bad that i am not noticing in my workflow...

[Chris MacDonald]

You're recommending something when you don't know what it does?

 

Clamp output essentially does away with having a floating point frame buffer, and means that everything above a given threshold (default is 1) is crushed.

[dheersreedh]

thanks to alll

[unrinoceronte]

You're recommending something when you don't know what it does?

 

Clamp output essentially does away with having a floating point frame buffer, and means that everything above a given threshold (default is 1) is crushed.

 

Well... i think i was clear on my comment and concern or doubt with my recommendation... When i select those two options, my artifacts sometimes go away. But i only now that from my own trial an error, i do not know the theory, or i did not understood it well when i read the help files... Since "clamp output" sounds like something important but its results are not so obvious to me, is the reason i was worried and i asked, but i didn´t tought that should stopped me of recommending along with an expressed "doubt". For you to have an idea, i dont know what a floating point frame buffer is... now i will run and google it... All i know is sometimes it helps for those things, but be warned there might be some other disadvantages on do in it...

 

Having said that, thanks for your explanation Chris.

[Chris MacDonald]

Sorry, I didn't mean my comment to come across so harsh haha. It's just that I see a lot of (popular) tutorials that are simply step by step guides, that offer no insight into why they are telling people to do things a certain way; which is all fine until someone needs to deviate from that setup; then they have no idea what the settings they have actually do.