How to extrapolate a point from Brep with specific distance

Grasshopper
1

Hallo dear rhino community,

Maybe is a dumb question, but as beginner I don´t find a fast solution.

I need to extrapolate from one/multiple surfaces (like windows), always a reference point on the central axis, wich is distant X cm (per Example 0.30cm), from the bottom line of the surface.

ReferencePoint
ReferencePoint1290×1092 16.3 KB

Is there a way to automatically create this point, insert only the surfaces as input?

Thanks in advance

John R.

2

this might work for planar surfaces

image
image1540×628 114 KB

3

Hi,

john window BVR re
john window BVR re1275×436 51.4 KB
john window BVR re.gh (7.4 KB)

Cheers,
BVR

4

Ciao @inno,

thanks for your time and solution,

but I have a error with the constructPoint component.

I insert your expression but don´t Work!!! (Expression did not return a valid value)
Can you please share me the GH file?

Greetings

5

Surface Example
john window BVR re 1.gh (9.3 KB)

john window BVR re 1
john window BVR re 11112×393 47.6 KB

6

Thanks @ajarindia,

this is a very good solution, I just have to be careful that the surfaces are all built in the same way, otherwise it does not match the side of the surface from which to extrapolate the point.

Greetins
John R.

7

here it is
Extrapolate_mid_point_at_distance.gh (7.1 KB)

in the expression editor, just " x/2 " is needed

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