Indigo Renderer Forum

Hi All,

i start to use indigo since two month. i have a rendered image that have lots of red and yellow fireflies and i dont know exactly how to remove them.

i used single color black and path tracing as render mode.
i would like to render the scene in night and light it with mesh lights (bulbs)

the glass in the scene is only a single surface and i used specular shader.

Did you try rendering with the GPU? Are you using glass acceleration?

A few points to consider:

Update to Indigo 3.2.9, most importantly.

Avoid interpenetration of the glass pane with backfaces (single sheets). Practice realistic modeling for realistic light behaviour. Minimal distance to figure contact should be 0.2 millimeters, consider a slightly higher margin.

Colour saturation and luminosity should not exceed 0.8/1.0 in general (200 over 255). Consider this as a maximum threshold for common materials. As a reference, you should know that white paper is only 85% white according to measures, never 100% ! We perceive colour as saturated and luminous but tend to largely over estimate the real values. Compensate with Camera Tonemapping.

If the problem persists, please share the scene for analysis, either publicly (pack Indigo scene, in Tools menu) or to support[at]indigorenderer[dot]com.

rockprincess89 wrote:the glass in the scene is only a single surface

Never, ever. By this you are signifying that the exterior (or interior depending on surfaces orientation) is solid glass.

In Indigo as in the real world, the light entering a glass volume MUST have an exit out, somehow. Single sheets are one way only, with no equivalent in real life.

see: http://www.indigorenderer.com/why-are-p ... nder-black

The indigo video tutorial on specular materials explains the reason very well. In Indigo as well as in reality light has to travel through a medium. A singe surface cannot accurately simulate that behavior.

And if everything was setup correctly as mentioned above, use supersampling 3 or higher to kill Fireflies quite effective...

i did another experiment i used camera dscs315_5 and i put iso 600 and EV 5.5.
In Fact i dont know how to use each response funstion?
the photo rendered 15 hours on core 2 quad 2.40ghz, 4GB Ram, nvidia 9600gt
the image look too dark but at least there is no fireflies.

Again i would like to render the scen in the night. So how can i get nice effect for the sky in the night through the winow?

Note: this model from 3d warehouse i download it to make some experiment with the light

First of all, change your render settings for that scene to MLT+BiDir for faster rendering!

The "Translucent_Glass_Aqua" Material you are using has a high IOR (reduce to 1.52 for glass) and also a ultra high Cauchy B value of 0.0203, reduce that value back to zero!

The emitter bulp material "[Tan]2" should be set as pure black diffuse material for best performance!


Your "Color_A05" material emitts light, why does it?! disable that, since it isn't contributing to the secen, does no sense and slows down rendering only (looow power light can cause extra noise!)

Disable light emission for following materials too:
- demonstration-Carpet[92]Solid Colors[92]Blue[44] Steel[44]Medium Pile
- Color_A15
- [CorrogateShiny]1
- demonstration-Solid Colors[92]Browns and Tans[92]Computer Beige[44]Light[44]Matte_SubMaterialB

following Materials are phong with IOR = 1, use a diffuse material instead if no reflection is wanted:
- demonstration-Carpet[92]Solid Colors[92]Gray[44] Dark[44]Medium Pile_SubMaterialB
- demonstration-Solid Colors[92]Browns and Tans[92]Computer Beige[44]Light[44]Matte_2_SubMaterialB"

Displacement on "demonstration-Solid Colors[92]Whites[92]Cool[44]Matte" (the brick wall) does no sense
without subdividing the mesh... a lot!

Bump Value for "Color_F05" is ultra high with 1meter (b=1).

"[Gold]1" is a Diffuse Transmitter, sure it should be one?


here is a 1min (!!!) rendering of the scene (with changed camera position) after performing the changes above:

Since you seem to be a beginner, check out Indigo Documentation for the material types and play with them.
Instead of just using materials from the MaterialDB, try to generate own materials or edit existing ones to get a feeling for Indigos material system. The knowledge of handling materials is very important... for every render engien.

A very valuable intervention from Zom-B, obviously

rockprincess89 wrote:i did another experiment i used camera dscs315_5 and i put iso 600 and EV 5.5.
In Fact i dont know how to use each response funstion?

Under direct daylight, ISO 100 EV -3.0 is a good starter, amid close variations.

If the scene remains black with such film sensibility then this underlines that light emission values are inadequate. Reinhard tonemapping is [usefull] before, or after the lighting stage rather than during it. Otherwise Camera tonemapping is best to evaluate lighting since it uses real world values.

Reinhard tonemapping can be extremely deceptive during the lighting stage when misused, leading then to distorted actions in order to find a balance. These twisted tweaks are often impairing performances.

thanks for you Zom_b but i read every word in the documentation but it is not so helpful. in the begining i wasn't able to see the effect of the parameter until i start to do serious experiments, i start to handle things. so again documentation is useful to a certain level.

could i ask what type of tone mapping you used

yes, documentation is maybe not optimal, but a good starting point. And knowing the theory only, doesn't let you land the airplane with the first try
Try & error is often needed to get a feeling for the material system, but that is for each other render too...

what exporter do you use?

This will help too... probably more than reading:
http://www.indigorenderer.com/forum/vie ... 19&t=11506

could i ask Zom- b what type of tone mapping you used?

rockprincess89 wrote:could i ask Zom- b what type of tone mapping you used?

yes you can
I simply raised the EV value.
Experiment a little with the whole Camera Models for tonemapping and use the one that fits your taste best.
Also check whitepoint control.

As CTZn hinted the light emission may be not adequat, raise the emission, or raise the camera exposure duration. The Tonemapping ISO value also can be raised higher then 600 by written a higher number in the textbox!

Here is the picture after 12 hours rednerings

i use the same position of the camera .