Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: visualform on 2015-01-13, 15:49:56

Title: white spots problem, exterior
Post by: visualform on 2015-01-13, 15:49:56

Hello,

Some time ago I decided to render Vray scene in Corona, exported materials using coronaConverter_v0.22 unfortunately came to me some white dots on the render, but I'm running out of ideas how to get rid of it, thanks for your help.

(http://imageshack.com/a/img661/5543/ArGFxz.jpg)

reflection

(http://imageshack.com/a/img537/5444/abp6dK.jpg)

close up

(http://imageshack.com/a/img905/9985/XKeCBF.jpg)

Title: Re: white spots problem, exterior
Post by: Ondra on 2015-01-13, 16:13:17

Is there sun in your scene?

What if you right-click the spots? What values do they have? INF/IND/or finite some number?

Title: Re: white spots problem, exterior
Post by: maru on 2015-01-13, 16:34:54

Is this progressive renderer or bidir/vcm?
Are you using sky+sun or hdr?
Can you show material setup for any of the materials with spots?

Title: Re: white spots problem, exterior
Post by: borisquezadaa on 2015-01-13, 16:38:14

Some material with way to high IOR in spec???

Title: Re: white spots problem, exterior
Post by: visualform on 2015-01-16, 00:19:22

Hi, sorry for such a late reply, lot of work lately.

So, in this scene is CoronaSun default, under 8 environment CoronaSky multiplier of 0.3, the rest of the default


- right-click the spots looks like this

(http://imageshack.com/a/img673/2572/yrqvtB.jpg)


- this is Progressive rendering


- material of bushes closest to the camera

(http://imageshack.com/a/img673/977/1IFBAC.png)

- Now I am looking for a high IOR

Title: Re: white spots problem, exterior
Post by: Ondra on 2015-01-16, 01:11:31

ok, then this is not probably render core error. Try disabling sun visibility to reflections, if there is a sun

Title: Re: white spots problem, exterior
Post by: visualform on 2015-01-16, 02:10:09

Ok, done, but unfortunately now there is no contrast reflections, I added HDRI map (picture on the left) in the environment and dot appeared again, I do not know what to do I have to do to be good in reflections


(http://imageshack.com/a/img538/6083/QoKbIe.png)

Title: Re: white spots problem, exterior
Post by: borisquezadaa on 2015-01-16, 03:28:17

What is the map in the reflection?... also leaves with fresnel IOR 3 is a little too much IMHO. Maybe thats the reason you got that hot pixels.
I blame reflection setting in materials.

Title: Re: white spots problem, exterior
Post by: maru on 2015-01-16, 08:50:48

This is probably because of wrong reflectivity. Change vegetation materials to reflection fresnel ior at about 1,3 and glossiness 0,5 and see if it renders better. There are also bright spots on the building, it is probably also too reflective.

If you are using skylight with 0,3 multiplier then you could have turned up exposure to compensate it and as result made sun even stronger. Try with sky and sun multiplier with default values (1).