11 replies [Last post]
ciani Offline
Joined: 08/04/2010

 

Here you find solutions to the most common problems you can experience in FELIX during your first steps.

Many of these tricks are useful for most rendering applications.

 

 

 

 

 

INDEX


     1) Underexposed and overexposed renderings

     2) Noisy interior spaces

     3) Instruction to make a seamless texture

 


 Underexposed and overexposed renderings


If your images are too bright,

 

you probably have to lower the exposure time in the 3DVIEW window.  

Lower exposure times correspond to higher "Aperture time" values because they are 

expressed in fractions of a second.

 

If your images are too dark,

 

you probably have to increase the exposure time in the 3DVIEW window.

Higher exposure times correspond to lower "Aperture time" values because they are

expressed in fractions of a second.

 

This could be the correct exposure.

 

 

 

 

 

 

 


 Noisy interior spaces


In interior spaces with small openings obtaining a good light distribution with the

"environment" lighting, even at render quality 4, may be problematic.

This is an example: render quality 3

 

To drastically reduce the noise simply go back to your modeling software, and in a new layer

(for example sky light)  build a polygon outside the window. Take care about the normals:

they have to be oriented toward the interior space. If the normal is oriented in the opposite direction no light

will enter in the space.

 

Reload  the 3D object in FELIX (Ctrl+r if have overwritten your previous file) and assign  the material ID 3044 to the new layer.

This is the result at render quality 3

 

If you now want to see the environment behind the emitter, simply hide the emitter from the camera,

activating the "HC" option in the layer list (Material Setup TAB).

 

 

Here is the result:

 

 

 

 

 

Instructions to make seamless textures


If you want to convert the photo here under into a seameless texture, you must apply the following procedure (oppure workflow).


you need Adobe Photoshop or Gimp.

 

duplicate the layer and invert it (CTRL+i)

 

desaturate the layer

 

Apply a gaussian blur to the image, choosing a diameter big enough to hide all small texture details.

The resulting layer has to show only the strong luminance variations areas of the image.


 

Center the Midtone slider in the middle of the histogram.

 

 

Change the blending mode of this layer to "overlay".

Merge the layers. As you can see the image now is more uniform.

The image shows a further problem: a strong chrominance variation.

 

In most cases quadratic textures are more versatile.

Therefore, change the canvas size of your texture  to a square.

Duplicate the layer again, move it, flip it horizontally and vertically or roatate it.

The purpose is to fill the entire square area. Use the "Clone" tool to cancel the overlaying lines (or any undesired element).

 

Use the "offset" tool to show how the edges of the image are matching each other.

`

 

This procedure helps hide the edge-to-edge repetition after the tiling in the 3D application.

Use the "Clone Tool” or the "Healing Brush Tool" again, to eliminate the sharp edges.

If the textures don't have any rich chromatic variations you can convert them into an indexed color image to reduce

To convert the image to 8 bit in photoshop choose image/mode/indexed color in photoshop.

Save it as PNG format and upload lod it in FELIX's "Textures Library".

 

 

 

SreckoM Offline
Joined: 09/08/2010

WOW gr8 tips, especially this tip to equalize lgithing of image. Tnx.

david Offline
Joined: 09/26/2010

Thanks! i just sow an error which now is fixed. The correct blending mode is "overlay" and not "screen".

buitrago Offline
Joined: 10/09/2010

Very good! it worked perfect, thanks a lot David!

ts Offline
Joined: 09/08/2010
Hi, ciani. Thanks for you nice trick! but my image still have fuzzy quality... added emitter though.your second image of dark quality one is definetly dark but seems like it is really smooth.How did you get this dark, but smooth quality? Im having difficulty to get smooth quality image for interior. 
david Offline
Joined: 09/26/2010
Hi TS, could you please send me by mail (daros@felixrender.com) the name of the project and the scene so i can easily tell you which is the problem?are you talking about this image? This image is smooth because only emitters are lighting up the scene. No direct sunlight is coming trough the windows.thanks!
projectory Offline
Joined: 08/03/2012
Ciao Massimo e David, sto provando Felix per fare dei render di esterni. Avete fatto davvero un gran bel lavoro, complimenti. Ho però un problema al quale non riesco a trovare soluzione, nemmeno leggendo il manuale: devo fare degli impatti ambientali usando foto mie. Come faccio ad inserire le immagini nel background della vista "camera"? Non saprei come altro fare per ricreare la vista della foto. Grazie e ciao! Paolo Chiantini
david Offline
Joined: 09/26/2010
Ciao Paolo,cliccha con il bottone destro sulla finestra OGL e scegli "set Background Image".Devi attivare la "A" nelle viste interessate (canale alpha) prima di lanciare il render.Il "compositing" vero e proprio poi lo fai in Photoshop.Ricordati anche di appplicare in photoshop al rendering di FELIX la funzione "remove back matte" per togliere il leggero alone nero che noterai attorno agli elementi scontornati dall'apha.a presto david    
lazzoga Offline
Joined: 02/10/2011
Hi everybody!I just started using Felix and I have some questions regarding the noise of the render. I read the topics reagrding the lightening and so on, but those are all regarding interior renderings, while I have noise in exterior renders. I was wondering what could cause that. The picture that I am posting shows an exterior render, quality 2, with a sky environment and made with those camera parameters:Focal Distance: 100.00FStop: 4.0 (btw, what does this parameter influence?)Aperture Time: 1600
View 06_239441_634854696360000000_634854697090000000_73_1_234_144.png
david Offline
Joined: 09/26/2010
Hi lazzoga, i think it's the environment which produces so much noise. Could you please tell me the ID of this environment so i try to fix it? For the moment epleace it with an other one and you should get much better esults even at quality 2.the Fstop parameter changes the depth of field of your image however you will notice it only in close-up  renders.If you increase the Fstop the Depth of field will be increased. remember that by increasing the Fstop you have to increase the "aperture time" to obtain bright images. http://support.nextlimit.com/display/maxwelldocs/Camera 
lazzoga Offline
Joined: 02/10/2011
The environment ID is 6491/32166. But I'm not sure that the problem is the environment because I tried also other options and other type of environment and my main problem was always the noise that was too high in every render. Maybe it's something regarding the camera parameters, I don't know. This is another render I did in quality 2, with the environment (ID: 5306/27484) with Aperture Time 800. 
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