Sun-path diagram and shading mask

Hi! How do you project the shading mask of a point and/or a surface on a stereographic sun-path diagram? (such as the ecotect images below- the left is from a point, the right, from a surface).

Thank you!

Replies are closed for this discussion.

Replies to This Discussion

Permalink Reply by Mostapha Sadeghipour Roudsari on February 2, 2015 at 6:38pm

Hi Helena,

There are two WIP components that let you draw shadow masks and combine them with a sunpath. The results is in 3D but you can project it to XY_Plane. I attached an example file.

Attachments:

ShadowMask.gh, 370 KB

Permalink Reply by Will Krzymowski on February 2, 2015 at 11:44pm

Love having it in 3D! Again, thanks for the great plug-in. I've also combined it with the watch the sky imagery (sky dome radiation) in photoshop, and wish that could be done in 3D. Mostapha?

Permalink Reply by Helena Zambrano on February 3, 2015 at 10:38am

Hi Mostapha,

Thank you for your answer, how do you adjust the time of the year for the shadow study. Using the grasshopper file you sent me, I put sliders in the sun-path component, but the shadows are not changing (file attached).

Attachments:

ShadowMask.gh, 365 KB

Permalink Reply by Abraham Yezioro on February 3, 2015 at 12:40pm

Helena,

The shadow mask is not supposed to change when you change the date. You need to move the base point for that ... or i understood wrong your question?

-A.

Permalink Reply by Chris Mackey on February 3, 2015 at 2:55pm

Helena,

This is a bit of a reiteration of Abraham's comment but the usual way that I have used the sky mask is to see that, if the sun falls within the shadow mask (in top view), you know that the sun is being blocked for that sun position. So the mask is meant to stay static while the sun moves.

-Chris

Permalink Reply by Helena Zambrano on February 3, 2015 at 5:21pm

Got it, thank you Abraham and Chris!

Is it possible to color the shadow from different "obstructions" according to the obstruction's color?

Permalink Reply by Mostapha Sadeghipour Roudsari on February 3, 2015 at 8:24pm

Yes you can! Just keep in mind that the component is WIP and sometimes it may fail generating the curves. Here is an example:

Attachments:

ShadowMask.gh, 371 KB

Permalink Reply by Helena Zambrano on February 4, 2015 at 3:53pm

Thanks Mostapha!

Permalink Reply by Chris Buntine on August 7, 2015 at 7:01am

Great feature. Managed to get it to work for OnGround but doing odd things for SkyDome.

Attachments:

ShadowMaskissue.gh, 366 KB

Permalink Reply by Mostapha Sadeghipour Roudsari on August 14, 2015 at 9:27pm

Hi Chris, The component is under development and there is good chance that it fails for complicated geometries but your case is pretty straight forward. Can you tell me what's exactly the issue in your case? Is it that you don't get the mask for one of geometries?

Permalink Reply by Chris Buntine on August 15, 2015 at 5:56am

Mostapha, maskedSrfOnGround works fine for the simple case of two boxes but when I change to maskedSkyDome no mask appears. maskedCrvsOnSky does show in mask although colours are incorrect. See attached. Thanks for taking a look at this.

Attachments:

ShadowMaskissue.gh, 368 KB

Permalink Reply by Mostapha Sadeghipour Roudsari on August 15, 2015 at 8:51pm

Hi Chris, You're right. The component needs some real work to be useful. In general Rhino's split functions can easily fail. In this case the script generates some invalid breps. Moving the point upward solves some of the issue but not all of them. See the attached.

Attachments: