Materials

Hi all,

So far the new gh components in DIVA 4.0 are looking great.

I was hoping that there would be a capability to vary the material properties via a slider in v4.0 but doesn't look like it. e.g. vary the light transmission of glazing via a slider. Can you confirm if this is the case please? I'm guessing I would have to make individual materials for each transmission, one for each step of the slider?

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Permalink Reply by Jon Sargent on May 25, 2016 at 1:11pm

Hi Ian,

You can actually put any radiance material description directly into the "M" input.  So to vary transmissivity of glass, for example, you could use a simple find-and-replace script:

Permalink Reply by J. Alstan Jakubiec on May 25, 2016 at 8:58pm

Awesome.

Permalink Reply by Ian van Duivenbode on May 26, 2016 at 3:45am

My thoughts exactly Alstan - new parametric variables :)

Many thanks for the tip Jon!

Permalink Reply by Mathias Sonderskov on September 28, 2016 at 2:33am

Great method with replace!

Maybe not everyone know the difference on transmission and transmissivity.

So if you have an LT value (Tn) then the relationship to tn is as follows:

tn = (sqrt(.8402528435+.0072522239*Tn*Tn)-.9166530661)/.0036261119/Tn,  where Tn is the transmittance.


(source http://www.radiance-online.org/pipermail/radiance-general/2010-Nove... )

thanks again, Jon


Jon Sargent said:

Hi Ian,

You can actually put any radiance material description directly into the "M" input.  So to vary transmissivity of glass, for example, you could use a simple find-and-replace script:

Permalink Reply by Jam Aka on February 20, 2017 at 8:55pm

Hello,

Thank you very much.

How can I run one time the simulation with some values of the visible transmitttance without animate the slider? If it is possible. The idea is to gain time. For example I run with 10 values of visible transmittance  that I input on the evening and have all results on the  next morning.

Thank you.

Permalink Reply by Jon Sargent on February 21, 2017 at 2:30pm

Create an input tree, like so:

Attachments:
Permalink Reply by Jam Aka on February 23, 2017 at 6:41pm

Thank you Jon Sargent, it runs

Jon Sargent said:

Create an input tree, like so:

Permalink Reply by Jam Aka on March 9, 2017 at 5:37am

Hi all,

Actually, I meet some problem with the results on the simulation of the DF when I vary the visible transmitance and run one time, like the tree above.

For example, when I put 3 values of "tn", the simulation runs 4 times so I have 4 outputs results, I don't understand why and only the first result is right. But few week ago, I ran it with the same type of input tree and it ran.

Thank you for your help

I attached the file

Attachments:
Permalink Reply by Mathias Sonderskov on March 10, 2017 at 9:20am

how do you add the rest of your scene then? As a flattened object output on top of the existing? or how do we make sure that the rest is applied to each tree branch?

Permalink Reply by Jam Aka on March 10, 2017 at 10:42am

Hi Mathias Sonderskov,

Thank you for your response.

I add object as flattened on another file and it runs.

But my big problem now, I always have one more simulation that the number of value  that I vary.

For example, I input 3 values of the transmittance and the simulation runs 4 times, so with 4 results of the mean DF.

I test with many values and I noticed that it's the first simulation that wrong, the results that I want are the 3 last.

My tree to vary the transmitance is like this

Permalink Reply by Jon Sargent on March 10, 2017 at 12:07pm

@ Mathias

Indeed, you need to add the rest of the scene into each branch.  There are tricks to do this, but the easiest way is probably to get  Andrew Heumann's Tree frog add-on and use the "Assign Paths" component:

 Jon

Permalink Reply by Jon Sargent on March 10, 2017 at 12:17pm

@ Jam

See my response to Mathias.  In the file you posted, you were bringing in your non-glass objects on a fourth path ({0}).  Note that it's always very easy to check this by hovering over the input:



Jam Aka said:

Hi Mathias Sonderskov,

Thank you for your response.

I add object as flattened on another file and it runs.

But my big problem now, I always have one more simulation that the number of value  that I vary.

For example, I input 3 values of the transmittance and the simulation runs 4 times, so with 4 results of the mean DF.

I test with many values and I noticed that it's the first simulation that wrong, the results that I want are the 3 last.

My tree to vary the transmitance is like this

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