Issue with results from 'Real time radiation Analysis' and grid size

[alicech]

Dear All,

I’m having some troubles with the Ladybug component ‘real time radiation analysis’. I have created two geometries: a more complicated geometry (as a list of meshes) and a simple one as a brep.

My first problem is that, even though I set the same gridSize, there are much more test points for the complicated geometry (see picture) which leads to a quite high computation time. Why is that? Did I not understand the concept of GridSize? (Both geometries have approximately the same area).

Second: After summing up all the values from the radiationResult from the ‘real time radiation analysis’ I end up having different results that the totalRadiation from the ‘Radiation analysis’ component, for the complicated geometry! For the simple geometry, it works well. (see second picture). I can’t understand it. Is it a bug?

I’m uploading the file as well if you want a closer look. I’m enabling all the components. Be aware when using it that it takes a bit of time to calculate.

Any help is very much appreciated, thank’s !

Ladybug_radiation_analysis.gh (111.7 KB)

Alice

[mostapha]

@alicech

My first problem is that, even though I set the same gridSize, there are much more test points for the complicated geometry (see picture) which leads to a quite high computation time. Why is that?

See this:

None Uniform Grid

Just for the reference here is how I would generate the uniform grid inside Grasshopper without using any plugins. uniform_grid.gh (26.1 KB) [image]

@alicech

Second: After summing up all the values from the radiationResult from the ‘real time radiation analysis’ I end up having different results that the totalRadiation from the ‘Radiation analysis’ component, for the complicated geometry! For the simple geometry, it works well. (see second picture). I can’t understand it. Is it a bug?

For comparison you have to multiply the values with face area. The total radiation is kWh not kWh/m2. See here:

Measuring units of the Radiation Analysis outputs

This is a reply to a questions from Jacob (and Abraham): “…****which measuring unit does your radiation component output?” There are two different outputs that has two different measuring units: radiationResult is the amount of radiation for each test point in [kWh/m2] Note: each test point is the center of a mesh face and the number represents the amount of radiation per m2 of that mesh face. totalRadiation is radiationResult for each point [kWh/m2] * area of the face [m2] so it is in [kWh…

[alicech]

Great thank you!
I wasn’t aware that the component was treating brep and mesh input differently!
I also found that now (maybe it can help other people):
“When you connect up breps, the component uses the _gridSize input to mesh the geometry based on that grid size but, if you input a mesh, the component will use the existing faces of that mesh and perform radiation analysis on each one of those faces.” (https://www.grasshopper3d.com/group/ladybug/forum/topics/radiation-analyses-grid)

[Hadeer]

Hello, i faced the same problem, my model consists of meshes not surfaces, is there an easier way to control the grid size other than making it as surfaces then do this surface divisions etc? Thanks