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Hello,

I have used McCryoT to determine the heat loads via radiation on my cryostat. When trying to generate some meaningful pictures for an upcoming presentation, I ran into some problems with the texture scaling:

- min and max values cannot be set individually, which leads to a reduction in the usable colorspace

- when switching to logarithmic scale the colorbar turns to black and white

- the min value is then set autmatically to the mininmum simulated value. I would like to use a fixed min and max value to compare different simulations.

Thank you for your time.

Kind Regards

Frederic Chill

Submitted by Marton Ady 8 years ago
Dear Frederic, McCryoT was a quick test project and it wasn't developed in the last 2 years. While I didn't encounter this bug, I'll double check as soon as I'll have myhands on a Windows machine. This week I'm out of office. I'll get back to you.
Submitted by Marton Ady 8 years ago

Dear Frederick,

I checked and everything is as you say. The min/max is deliberately the same, I believe a scale which changes linearity at 0 would be confusing.

The colorbar turns black and white at log values because the framework I use doesn't allow a negative / positive log scale display. Nevertheless it does the scaling correctly, between the smallest value corresponding to black, and the negative/positive parts of the scale following colors logarithmically. Implementing this correctly would be possible but I don't plan it as McCryoT was last used by us in 2012 (sorry).

Anyway, let me give you an advice just to check if you use it correctly:

  • All surfaces should have Cosine desorption enabled
  • Texture should count desorption AND absorption (absorption is counted positively and desorption negatively), unless you want to visualize only the emitted/received heat and not both
  • All surfaces should then have their temperatures and emissivities assigned.

That's it. Good luck, Marton