Hi All,

I am trying to run a point in time glare and annual glare analysis for space which has 3% openness factor fabric shade behind glass.I have used the "trans" material to represent fabric shade( material listed below). However, I am running into of issues and need some help or suggestion in getting this to work.

1. when I try run the point in time glare analysis for a camera view, the glare image that is generated has no details of the camera view. ( I have also tested a quick visualization for the same camera view and it also have no geometry in it except for the ground plane) 

2. I am not sure if the trans material definition listed below is correct and it is being applied to the surface. Have I got the "trans" material incorrect?

#3% openness factor fabric shade
void trans 3perOpns_shade
7 0.90 0.90 0.90 0 0 0.06 0.17

I have uploaded the rhino file along with material definition file.

Any help or suggestion would be of immense help.

Thanks for your time!


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Hi Aditya,

The issue is that you have set a clipping plane in Radiance with the '-vo 11.8' option. So your geometry is being clipped away. Without that, your model seems to work as expected.

Separate comment: For your glare analysis, you will want to remove the '-i' option as the visual comfort models work with luminances, not illuminances.



HI Alstan,

Thank you for pointing out the problem.The simulation ran as expected. However, I am puzzled as to how the "-vo 11.8" got into the rpict parameters since, I had not edited the parameters. I only used the clipping plane in Rhino and then deleted it subsequently. Does having a clipping place automatically put in -vo in DIVA?

As for the point in time glare, I did not put in "-i" parameter either.  the only step prior to running point in time glare was running a scene  visualization. I just assumed that point in time glare analysis run with out "-i" in there rpict parameters.

I have other questions with respect to surface normal for the glass and internal fabric shade. Does the orientation of the surface normal matter for glass and trans material? currently I have them both pointing inwards toward the space?

Appreciate your timely help and responses.



Hi Aditya,

The rpict parameters are preserved between calculations, so if you (or some other user of the file) ran a calculation before using a clipping plane or calculating illuminance, that will be kept until you manually remove it. DIVA doesn't do any intelligent parsing of the rpict parameters. It also doesn't add the clipping plane parameters in, even if you have a clipping plane in Rhino, so I can't explain how that got there.

> Does the orientation of the surface normal matter for glass and trans material?

No! It doesn't matter for those materials.



Hi Alstan,

Ah yes, I understand now- I have used a previously worked on file(some other user) and re purposed it for my analysis. .Thank you again for the clarification and quick response.




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