Strange rectangular shadow artifact in rendering

[tapia]

Hi! Firstly I wanted to thank the developers of this software! It is really great!

I am using it to model my small apartment and have been having a slightly annoying problem with the render.
I am trying to create a "paper lantern", which is one of those typical balls made of papers that you can hang so you can have a nice light.
So I defined a material, like this:

Code: Select all

newmtl lamp
Ns 1.0
Ka 0.3 0.3 0.3
Kd 0.5 0.5 0.5
Ks 0.2 0.2 0.2
Tf 1 1 1
Ni 1.100000
d 0.8
illum 9
sharpness 10

map_Ka lamp_globe_white.png
map_Ks lamp_globe.png
map_Ns lamp_globe.png
map_Kd lamp_globe.png

I am no expert in wavefront, but after playing with the values for a while I think that I got the effect I was looking for:



The problem is that strange artefact (the rectangular shadow) that appears when I make the rendering. If, instead of the defined texture, I apply a color (from within sweethome3d), then I get this result:



There is no artefact anymore. That means that there must be some problem with the definition of my material. But what? Can anybody help me, please?

[bdfd]

Hi,

Have you verify that you have not a very thin transparant object over the bed ?

[;)]

[tapia]

I am sure that there is nothing in-between there. I have even taken all the furniture out and the problem is still there:



From another perspective, exactly the same can be observed:



The shadow region always fits exactly some number of the square regions that take care of the rendering (the regions that get computed by each core). So that is why i looks like some problem with the rendering process.

[Puybaret]

Could you share your simplified project or send it to [url=mailto:[email protected]]me[/url]?

[tapia]

Could you share your simplified project or send it to [url=mailto:[email protected]]me[/url]?

Hi! I have just e-mailed it to you

Thanks for the help.