how can i get rid of those blotches:(

[th_clubber]

i tried to make a cafe render...i used vray sun+vray phy. camera..but i couldnt get rid of those blotches on the walls:( what causes these?all the materials i used were vray-materials..

can anyone help me?

[STRAT]

what are your gi settings?

[th_clubber]

primary bounces IR map mult. 1,3

sec. bounces quasi-monte carlo 1

 

IR map high

qmc primary and secondary bounces 8

[STRAT]

they look like low settings even though you say high. can you actually post a screen grab of the settings? (your explanation doesnt say much)

[th_clubber]

honestly the main file s in my laptop...but i m posting the settings i remember from the actual file..i hope they give u a good picture about the settings...

[STRAT]

never mind. i was hoping to see your irradience map settings

[th_clubber]

ok..here r the settings for the image...i m looking forward to ur replies and help...

thanks...

[Brian Smith]

it's your interpolation samples. large splotchy noise is almost always because of the irradiance map and fine granular noise is always always image sampling. the one exception is when using qmc/dmc for gi which can also cause fine granular noise. increase your interpolation samples to 80-100 and the splotches should go away. also, that 8 for image sampling is way higher than you should ever need. try 6 for a max. of course, the 8 is useless if your noise thresh value is too low to allow it to try for 8 subdivisions. i recommend always disabling the use noise thresh option so that the max subdivs is always guided by the clr thresh value rather than a value like noise thresh which controls all blurry effects.

[Tim Saunders]

This may also depend on the resolution of your rendering. Is the actual rendering the same size as the one posted? If it is larger, you may need to drop your min and max (in the IRR settings) down a couple ticks.

 

I see people with this issue a lot when they don;t understand that the IRR map is based on resolution, not world units. If your image looks great in test renders (600-800 px wide) and you render the final at 2400-3600px wide, you will need to decrease the min and max by about 2 each-that has been a consistant result for me.

 

The presets are meant to be used for low rez images. When you drop the min/max for hi rez images, you will get smoother results in a shorter time.

[Brian Smith]

This may also depend on the resolution of your rendering. Is the actual rendering the same size as the one posted? If it is larger, you may need to drop your min and max (in the IRR settings) down a couple ticks.

 

I see people with this issue a lot when they don;t understand that the IRR map is based on resolution, not world units. If your image looks great in test renders (600-800 px wide) and you render the final at 2400-3600px wide, you will need to decrease the min and max by about 2 each-that has been a consistant result for me.

 

The presets are meant to be used for low rez images. When you drop the min/max for hi rez images, you will get smoother results in a shorter time.

 

great point...to add to that, when you blow up an image, the result is a blurred effect. when you blow up an ir map by dropping the resolution relative to the image resolution, the ir solution is blurred. what confuses a lot of people is that when you increase the ir map resolution, you bring out detail...which means you make the splotches more pronounced. they will be smaller but usually more pronounced. so instead of improving your image, it often makes your image look worse. as this is why i say that using a High preset is rarely necessary. it's only necessary to bring out really fine detail. but the higher the resolution, the more you tend to have to increase int. samples.