Search found 80 matches

by mick
Sat Feb 09, 2019 10:53 pm
Forum: User Support
Topic: problem with orthographic camera
Replies: 26
Views: 15065

Re: problem with orthographic camera

OK, but this bring me back to the point that orthographic camera does not work.
by mick
Sat Feb 09, 2019 9:57 pm
Forum: User Support
Topic: problem with orthographic camera
Replies: 26
Views: 15065

Re: problem with orthographic camera

Thanks, I found the flag.

I found out that the orthographic rendering looks fine when I change the opacity of the glass to 0. Opacity seems to have no effect on perspective camera.

What is a glass opacity when a volume is defined???
by mick
Sat Feb 09, 2019 9:25 pm
Forum: User Support
Topic: problem with orthographic camera
Replies: 26
Views: 15065

Re: problem with orthographic camera

I created the scene in blender, more or less. At least it shows the same strange behavior for orthographic camera.
File attached.

To compare just move to camera to e.g. z=-1 or switch to Perspective.

BTW: How to make objects camera invisible in blender?
by mick
Sat Feb 09, 2019 5:52 pm
Forum: User Support
Topic: problem with orthographic camera
Replies: 26
Views: 15065

Re: problem with orthographic camera

No, I'm using BIDIRCPU. I need to simulate optical lenses. I've no idea what archglass does. But I assume it does some tweaks, so it would prevent physical realism for sculptured lenses, right? I don't think that there is a numeric issue. There are no extreme dimensions or ratios. What can I send yo...
by mick
Sat Feb 09, 2019 3:39 pm
Forum: User Support
Topic: scene.volumes.<volume name>.absorption
Replies: 9
Views: 5167

Re: scene.volumes.<volume name>.absorption

Thanks, Dade. With that references I should be able find out what I need.

Would please also take a look at my other problem: viewtopic.php?f=4&t=903

Thx
by mick
Sat Feb 09, 2019 3:37 pm
Forum: User Support
Topic: problem with orthographic camera
Replies: 26
Views: 15065

problem with orthographic camera

Hi, I've a simple scene: a box with open top, roughly a quarter of the top covered by a glass plate, the sun in zenith, no sky2 or other lights. Just the bottom of the box and a black plane below that bottom is camera visible. Rendered with default camera origin just below the top looking to the cen...
by mick
Tue Feb 05, 2019 7:01 pm
Forum: User Support
Topic: scene.volumes.<volume name>.absorption
Replies: 9
Views: 5167

Re: scene.volumes.<volume name>.absorption

You can plug a colordepth texture into the volume's absorption slot for easier usage: https://github.com/LuxCoreRender/LuxCore/blob/master/src/slg/textures/colordepth.cpp#L45 To explain the parameters: kt is the color of white light after travelling the distance d . I saw this in blender. But this ...
by mick
Tue Feb 05, 2019 6:58 pm
Forum: User Support
Topic: scene.volumes.<volume name>.absorption
Replies: 9
Views: 5167

Re: scene.volumes.<volume name>.absorption

Dade, thanks for the reply. Transmittance = Exp(-<absorption> * <distance>) I'm aware that this must be an exponential function. But is it exactly that function with a base of e? power_out = power_in * e^(-absorption * distance) So with an absorption of 0.7 a glass plate with a thickness of 1 reduce...
by mick
Mon Feb 04, 2019 11:03 pm
Forum: User Support
Topic: scene.volumes.<volume name>.absorption
Replies: 9
Views: 5167

scene.volumes.<volume name>.absorption

What is scene.volumes.<volume name>.absorption exactly?

The ratio of power loss of a ray traveling 1 unit through that volume? So glass with a thickness of 1 and absorption of 1 is opaque?
by mick
Mon Feb 04, 2019 10:52 pm
Forum: User Support
Topic: pyluxcore: Issue with camera or tonemap???
Replies: 0
Views: 2402

pyluxcore: Issue with camera or tonemap???

Please help me! I'm getting crazy. I generated a simple scene: open box, half of it covered with a glass plate, sun/sky exactly in zenith. Rendered "normally" looks sort of realistic. image_rgb.png But I need to measure irradiation on the floor of the box. So I make the walls and glass pla...