Material Problem

[yogeshwagh]

hi to all,

i am using a wood material in my scene. i am using all high render settings in my scene. but i m getting some grains in my wood texture. in animation some grains are coming in my specular objects and these grains are moving like jitters.

i am getting stuck with it . i have tried all the options of the settings. i m using Vray 1.47. is it a the version problem.?

 

my render settings are as follows:

1) my scene is of one room. in that room total 6 windows are there ok, 3 on left side and 3 on rightside. i m using Vray lights total lights are 6 . all the lights are facing in the room.

 

2) my light settings are having 15 multiplier for each light and i m using subdivs of 16 for shadow. store with irradiance is off smooth shadow is on.

 

3) now lets move to my render settings.

i am using three level sampling i.e Adaptive subdiv .

min samples are -1 and max samples are 4 normals check box is on.

 

for GI i am using first engine set to irradiance map and secondary engine to lightcache map.

 

in my render settings i m not using any environment lightin this scene, no HDRI lighting.

 

for irradiance map settings i m using high animation settings with 50 subdivs and intr smpls are 30.

 

for light cache map settings are as follows:

subdivs are 1000

smpls are 2

pre filter is on valus is 20

store direct is off.

 

i m not using any color mapping .

 

now lets move on my material settings

i m using one diffuse map i.e wood material

i m giving reflection value of 59 59 59

relflection glossiness value is 0.65 with falloff

and reflection subdivs are 16 instead of 8.

 

hope u can get all my scene in details from these. if u find anything wrong in these settings pls do let me know. and give me the solution on it.

[FlytE]

try making the reflective subdivisions of your wood material 50, not 16.

[yogeshwagh]

try making the reflective subdivisions of your wood material 50, not 16.

 

hi ,

thanks for reply. Already i have tried this solution . with these solution i got the smooth specular but the rendertime is to high. if i increase the subdivs then it takes 6 hrs per frame after calculating irr map and lightcache.

is ther any other solution to solve this problem?....

 

Thanks

Yogesh

[ebad]

Just a notice!

This is not your solution but,

I think SHph = 50 and InterpSamles = 30 is too low for High preset ,you would use Medium and get better render.

[Christopher Nichols]

Sounds more like you are having a texture problem... that can be solved with better AA settings.

 

Try going from -1,4 to 1,2 if you are using adaptive.

 

Or using 1,6 to 1,10 with QMC and turn the noise threshold to 0.001

[yogeshwagh]

Sounds more like you are having a texture problem... that can be solved with better AA settings.

 

Try going from -1,4 to 1,2 if you are using adaptive.

 

Or using 1,6 to 1,10 with QMC and turn the noise threshold to 0.001

 

thanks a lot chris for replying me and giving me the solution.

this solution is working but not 100 percent. and another thing i want to ask you if i do this settings my rendertime is increased upto 6 hours per frame, with my previous settings it is taking 4 hours per frame bypassing the time for iradiance calculations and lightcache calculations.

is there any other solution to render it with the maximum quality and less rendertime. my deadline of this project is in the 2nd week of october. so please help me to give some soluitons.

 

 

thanks

Yogesh

[FlytE]

can you maybe post your scene?

[hieu liem]

I'm a newbie, please give me link down egzVrayMaterials and use, thanks

[yogeshwagh]

can you maybe post your scene?

 

hi thanks for your reply,

i have posted my scene...

[Christopher Nichols]

Your problem is a classic issue of noise/quality/rendertime. While it is more obvious and visible in Maxwell, it is still there (all be it more subtle) in Vray and others. If you want higher quality you are going to have to sacrifice rendering time. Once you get your max min values set high enough. I usually use QMC AA with 1,25 up to 1,100... then it is a matter of lowering the Noise threshold to just the right number that the noise is gone and your rendering times are accepable. If you can get away with 0.01, great. But, in some cases, with dark scenes, I had to go as low as 0.0002... and yes, your rendering times will go up. It is the balance game you have to play.

 

There is a thread on the subject here written by vlado:

http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=14747

[yogeshwagh]

Your problem is a classic issue of noise/quality/rendertime. While it is more obvious and visible in Maxwell, it is still there (all be it more subtle) in Vray and others. If you want higher quality you are going to have to sacrifice rendering time. Once you get your max min values set high enough. I usually use QMC AA with 1,25 up to 1,100... then it is a matter of lowering the Noise threshold to just the right number that the noise is gone and your rendering times are accepable. If you can get away with 0.01, great. But, in some cases, with dark scenes, I had to go as low as 0.0002... and yes, your rendering times will go up. It is the balance game you have to play.

 

There is a thread on the subject here written by vlado:

http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=14747

 

lots of thanks chris,

 

All of my other projects are rendered in average range of 40 to 50 mins per frame with controlling the settings. and all those are apporoved. but only this project having such problems.

thanks for helping me and giving me your valuable suggestions. i will try my level best to render it with the less time and max quality. last we are tried is taken 5 hours tweaking some settings in noise thershold.

 

Thanks again

 

Yogesh