How to project curves from a single point to a surface

usk.y2667 · February 17, 2023, 3:21am

Hello guys,
I would like to transform a shape like a shadow from point light.

I need your help,
Thanks, Yusuke

pascal · February 17, 2023, 3:25am

Hi Yusuke - please post an example file.

-Pascal

usk.y2667 · February 17, 2023, 3:42am

Hi Pascal

Actually it is more complicated though…
sample.3dm (663.6 KB)

usk.y2667 · February 17, 2023, 3:47am

A shadow pattern in the yellow line is the pattern I would like to have as nurbs curve.

jeremy5 · February 17, 2023, 9:30am

Is this what you mean?

Regards
Jeremy

Tom_P · February 17, 2023, 10:01am

work in wireframe !!!

query the light position
_what
copy the position
draw a point
_point
paste above position

use the initial Pattern
_extrudeCrvToPoint (to above point)
_scale … (center = point above)

result are the blue surfaces in my case

_intersectTwoSets
to get the curves on the target surface
(don t use _intersect !)

kind regards - tom

usk.y2667 · February 17, 2023, 12:40pm

Hi Jeremy,
Yes, it is exactly what I want!

usk.y2667 · February 17, 2023, 12:48pm

Hi Tom,
It works as I hope! thank you very much!

jeremy5 · February 17, 2023, 12:57pm

Tom has already explained, saving me the bother!