Python for light simulation

[mostapha]

@fhalawa1

The code I sent works perfectly to simulate how sky light enters to one room right?

No. The code that is posted adds two windows to room walls. It’s not sklights. You can read it in the comments.

@fhalawa1

But this is not how light simulation works for a layout Light will enter from the window and if the room is placed in the middle of the layout the room will get less light, right?

I’m not sure if I understand what you mean by a “layout” but there is no such a rule in general.

@fhalawa1

First how to pull weather data for a specific location (say new york) where I am?

I already replied to this question under similar topic. See here:

Running Python code for light simulation

The sample file is running the simulation with an overcast sky which is not taking location into consideration. That’s why the sky is generated with CertainIlluminanceLevel. sky = CertainIlluminanceLevel(illuminance_value=2000) It depends on the type of the study but if you are looking for a point-in-time simulation then you should use climate-based sky instead: https://www.ladybug.tools/apidoc/honeybee/honeybee.radiance.sky.html#module-honeybee.radiance.sky.climatebased To pass weather d…

Please do not open duplicated topics so we can help you easier.

@fhalawa1

How can the simulation understand the orientation of the building? Maybe there is a function that says Getorientation(north, south) … I am not sure how does honeybee do this.

In honeybee Y axis is north. In the example the room is rotated using rotation_angle argument.

room = Room(origin=(0, 0, 3.2), width=4.2, depth=6, height=3.2, rotation_angle=45)

@fhalawa1

How to adjust the model to understand that I have rooms inside a layout so that walls in these rooms would hinder light from passing by (In other word, how to conduct a simple simulation study for the layout showed)

You have to create each room separately and then add them all to the recipe instead having a single room. In that case you will get a single scene with 3 rooms.

EDIT: You will also need 3 analysis grids, one for each room if you are interested to get the values inside each of the 3 rooms.

room_1 = Room(origin=(x1, y1, z1), ...)
room_2 = Room(origin=(x2, y2, z2), ...)
room_3 = Room(origin=(x3, y3, z3), ...)

# ...


rp = GridBased(
    sky=sky,
    analysis_grids=(analysis_grid_1, analysis_grid_2, analysis_grid_3),
    simulation_type=0,
    hb_objects=(room_1, room_2, room_3)
)

@fhalawa1

if I can get number of hours on direct sun per year ) that would be perfect.

See SolarAccess recipe. You should use that instead of the grid-based recipe and you will need sun vectors which you can generate using sun-path. Here is an example:

ladybug-tools/honeybee-grasshopper/blob/59fdd60421c06120bab16a4e26ea2c71c3740031/plugin/grasshopper/src/HoneybeePlus_Solar Access Recipe.py#L38