WHITE SPOTS w/ vray lights

[Arnold Grove]

Funny white spots w/ vray lights. Settings as follows; version 1.5 w/ max 9

 

AA: Adap QMC and Mitchel Net

 

GI: I Map & LC. I map on Med...LC 1500 sampkle size 0.02

 

color map is linear

 

rQMC: 0.85, 0.001 , 15, 1.0

 

adap rQMC 2 / 4 w/ use qmc thresh checked

 

vray psy camera, vray lights are spheres

 

I set the dif sub to 3000 and 64 sub div for sampling

Edited July 9, 2008 by Arnold Grove

[Brian Smith]

are you using the vray light material? i am lost as to what you mean by dif sub to 3000.

 

btw, you are not really using adapt qmc for your image sampling. when you 'use qmc thresh', the image sampler looks to the 0.001 value you have set for the color threshold of your image sampler, and with a near perfect color threshold setting like this, it will try to achieve a near perfect image sampling. it obviously cant do this, but the next best thing it can do is use the max subdivs value for every pixel. basically, you are using a fixed rate with a subdivs value of 4. just thought you might like to know. i would suggest always disabling the 'use noise thresh' option, and always leaving the noise thresh value at 0.01 (except for rare situations). a good value to start with for the clr thresh would be 0.005 and going down to 0.003 on occasion.

[Arnold Grove]

thank you Brian...love the book by the way..its right next to the bed and Im on my 3rd read through. The 10 tips in the back is worth the price alone.

 

are you using the vray light material? i am lost as to what you mean by dif sub to 3000

 

Not a light mat...sorry I wasnt more clear on that...I right clicked on my vray light sphere and for the vray properties I set the diffuse subdivisions to 3000...default is 150 I think.

 

I tyhink I get the rest of what youre saying...I have vray page opne now and i am reading through it.

 

so the sampling is why i have the spots then?

[kippu]

keep those diffuse subdivs at default ...what materials are you using on them now?

[Arnold Grove]

all vray mats w/ 8 sub div's. I just did a render w/o GI and didnt have spots so it must have to do w/ the GI solution. Did a render w/ no secondary bounce and spots are there.

 

im putting default dif back to 150

 

i dont need to knock this up anyway?

[Arnold Grove]

spots anyone?

[Brian Smith]

there could be a lot of reasons for the white spots and with the information you provided, it would be shooting from the hip to try to say why. what i would recommend is the following:

 

apply an override material to your scene to see if the spots still appear. if not, it's a material problem. if so, then start over from scratch...meaning merge your objects into a new scene so that all the render settings render to their default value. i would also recreate each light and use default values. if you dont do this, then you might have a lot more trouble trying to return all the settings back to default value...you might have changed something without even realizing it or might forget something that you did change. i would definitely not use the vray physical camera until you get the scene looking right without. only when you do get it right should you implement the camera.

 

try the following test render settings (not production settings). leave everything as default.

 

irradiance map: very low, hsph subdivs=20, int samples=20

light cache: subdivs=250

image sampler=adapt subdivs with default values

[Arnold Grove]

thanks brian. i will post my results asap

[tayrona]

I could be wrong, but once, I got white spots like those in your render....... I forgot to change the "from file" in the Irradiance map mode...... so it was not calculating a new Irradiance map, it was using another file/camera imap......

[Arnold Grove]

I used an override material and still have the spots. I dont get the spots when I render w/o GI. So I changed the secondary to a photon map but max keeps crashing. (yet another issue)

 

BUT...I also replaced the multi-sub object mat (my walls) with one vray mat. No spots. I had to tend to other duites so I closed without saving and when I came back to the project and repeated the last move with the replaced the multi sub material again with a vray mat...it then rendered with the white spots again. Very strange.

 

Im thinking it might have to do w/ the multi-sub material and the method of GI.

 

I disabled the secindary pass and still got the spots w/ the I map as primary. The only time they appear is w/ the vray sphere lights. I replaced these and started a new scene as per your suggestion and still have the spots.

 

Again, not w/ IES or max lights (spots or omni's) I Map setting is default. But still trying to figure it out though.

Edited June 5, 2008 by Arnold Grove

[syamskm]

try sub pixel color mapping. It may be bcoz of insufficient subdivision value of the material.

[rakeshtagotra]

I think u must be using caustics option. just uncheck that option and hopefuly ur problem will be solved....

[Arnold Grove]

Im trying both options now...ill post asap,,thank you

[leighdon78]

I could be wrong, but once, I got white spots like those in your render....... I forgot to change the "from file" in the Irradiance map mode...... so it was not calculating a new Irradiance map, it was using another file/camera imap......

 

I had this same problem. Thanks Diana.

It was the Irradiance map was set to add incremental. So must have been using a previous image based map.

Thanks heaps. Saved me hours of searching.

[Boris Horosavin]

Hi, could you please send some preview it would be easier to track the problem. I think you subdiv. parameters are way to high, there must be something else making problem... Also, why using Vray physical cam if you're not using Sun?