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

[dima glib]

Why not just use Object.ray_cast
<https://www.blender.org/api/blender_python_api_2_77a_release/bpy.types.Object.html?highlight=ray_cast#bpy.types.Object.ray_cast>
or Scene.ray_cast
<https://www.blender.org/api/blender_python_api_2_77a_release/bpy.types.Scene.html?highlight=ray_cast#bpy.types.Scene.ray_cast>
?

On Sat, Aug 20, 2016 at 10:20 AM, Bastien Montagne <montagne29 at wanadoo.fr>
wrote:

> 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
> <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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