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I'm controlling Blender's shapekey in the following Python script.

This still works fast enough, but is there any low layer code that works faster?

import bpy
selectList = bpy.context.selected_objects

if selectList[0].data.shape_keys:
    for block in selectList[0].data.shape_keys.key_blocks:
        block.value = 0.5
taichi
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1 Answers1

3

foreach_set

To avoid looping over collection and setting a property value per item can instead use collection.foreach_set(property_name, values) [Find numerous links re this']

The values list is a flat list, eg if the property uv for example is a vector then the list

values = [u0, v0, u1, v1, ...., un, vn]

For keyblock values

import bpy

context = bpy.context


ob = context.object
me = ob.data
sks = me.shape_keys


if sks:
    vals = (0.5, ) * len(sks.key_blocks)
    sks.key_blocks.foreach_set("value", vals)
batFINGER
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  • Great! Is there a way to avoid the assignment if, for example, I don't want to assign a value to the third value of key_blocks? Is there any way to have a list of [smile_L,eyeClose_L,smile_R,,eyeClose_R] and ignore smile_R? – taichi Aug 19 '21 at 22:00
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    Can load the current values into a flat list with foreach_get eg https://blender.stackexchange.com/questions/1412/efficient-way-to-get-selected-vertices-via-python-without-iterating-over-the-en/233823#233823 – batFINGER Aug 20 '21 at 03:15