OTOY Forums

HI All

Below a test render of a leather chair, I get a lot of hotpixels.
Can any one tell me what I do wrong here???
Also If you see other things that could be better let me know,,, thanks...

Settings
DL 3 (AO) diffusedepth 8, max sample 1000 (4 min) (1920x1080)

Light
Only daylight (New), no other light source.

Leather material.
Glossy with leather texture and bump map.
Specular = 0.063
Roughness = 0.00
Index = 1.0

Glass in window
Diffuse material
Opacity = 0.00

Hotpixel removal = 0.6

Thanks, Claus

The hotpixel removal works in reverse. Have you tried setting it to 0?

Obizzz wrote:The hotpixel removal works in reverse. Have you tried setting it to 0?

Hi
Yes tried that,,, still a lot and heavy hotpixel's.

Claus

try to make sun size bigger (or lower it's intensity and go up with camera iso), or try to light the scene with HDR.
Sun is a very powerful source tha'ts why you have hot pixels, you can allso try to use pcm or path tracing kernel type.

Also, take the Index value off of 1.0 for the leather material. This should help. Maybe 1.3.

change your glass from the window to glass fake falloff in the database. Also change the caustics blur in your kernel settings

clausgs wrote:HI All

Below a test render of a leather chair, I get a lot of hotpixels.
Can any one tell me what I do wrong here???
Also If you see other things that could be better let me know,,, thanks...

Settings
DL 3 (AO) diffusedepth 8, max sample 1000 (4 min) (1920x1080)

Light
Only daylight (New), no other light source.

Leather material.
Glossy with leather texture and bump map.
Specular = 0.063
Roughness = 0.00
Index = 1.0

Glass in window
Diffuse material
Opacity = 0.00

Hotpixel removal = 0.6

Thanks, Claus

For the windows you can use a specular material with fake shadows enabled if the glass is modeled as a real object (with a front and back plane). If it is a single plane then the best approximation is a glossy material with glossy = 1.0, index = 1.0 and the alpha set to a falloff map with the normal input set to approximately 0.1.

For the leather set the glossy reflectance to 1.0 and the index to around 1.2 (tweak this value) for a better appearance. This should not make much difference in noise.

Please post an image with hotpixel removal off (set to 1.0), this makes it easier to figure out what the problem is.

Do you have the same noise when you switch off the bump map?

--
Roeland

HI All

Thanks for your suggestions, I will try some of them to see the outcome.
Hopefully I will post some of the renders (work in progress ) later on.

I will also try a HDRI light source as they normaly gives less hot pix.

Claus

HI

DL 4, 1000 samples, diffuse depth 7
12 minutes
Image size = 1200x1200 pix

HDRI as light source.
A curved plane in the back to give a bit more light to the scene.

No Hot pix at all.

Pleas tell me what you think???

Claus