[Bf-python] Find Z location on surface of displaced mesh

[Bastien Montagne]

Hi Todd,

You should rather use <your_mesh_object>.to_mesh() [1], use that temp 
mesh to get what you want, and the remove() it from data.meshes. 
Obviously, if you call your func several time at the same frame, cache 
the temp mesh, no need to re-create it every time.

Incidentally, you never remove your temp empty object in your code, 
which is bad, since you keep adding one on every call... ;)

Cheers,
Bastien

[1] 
*https://www.blender.org/api/blender_python_api_2_77_0/bpy.types.Object.html#bpy.types.Object.to_mesh*

Le 20/08/2016 à 08:36, Todd McIntosh a écrit :
> Hi everyone,
>
> Quick question. I've put together a little function to find the 
> matrix_world Z location of a point on a displaced mesh (plane with 
> ocean mod) given the X and Y coordinates. I'm using an empty with a 
> shrinkwrap modifier to achieve this.
>
> I was wondering if there is a faster or more direct way in python to 
> do this.
>
> Here's what I have so far.
>
> *****************************************
>
> import bpy
>
> def getZLocation(xLoc, yLoc, targetMeshName):
> o = bpy.ops.object
> d = bpy.data.objects
> targetMesh = d[targetMeshName]
> o.add(type='EMPTY', location=(xLoc, yLoc, 0))
> empOb = bpy.context.active_object
> empOb.name = 'empLocate'
> o.constraint_add(type='SHRINKWRAP')
> empOb.constraints['Shrinkwrap'].shrinkwrap_type='NEAREST_SURFACE'
> empOb.constraints['Shrinkwrap'].target = targetMesh
> o.select_all(action='DESELECT')
> return empOb.matrix_world.to_translation()[2]
>
> print(getZLocation(xLoc=2.2, yLoc=4.1, targetMeshName='Ocean'))
>
> *****************************************
>
>
> Also, it seems to take a few seconds to actually compute this value, 
> so something faster would also be great.
>
>
>
> Thanks,
>
>
> Todd McIntosh
> Resonance Media + Design
> Phone: +1 (905) 471-5048
> Email: todd at resonancemedia.ca
> Skype: toddmcintosh
> <http://www.getpostbox.com>
>
>
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