# Subtractive Blueprint Object

**URL:** <https://forums.unrealengine.com/t/subtractive-blueprint-object/297427>\
**Category:** Blueprint\
**Tags:** unreal-engine, Blueprint, question\
**Created:** [October 27, 2014, 8:58pm UTC](https://forums.unrealengine.com/t/subtractive-blueprint-object/297427 "2014-10-27T20:58:27Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![TJ\_V](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/tj_v/32/1008648_2.png) [@TJ\_V](https://forums.unrealengine.com/u/TJ_V)\
**Post date:** [October 28, 2014, 4:46pm UTC](https://forums.unrealengine.com/t/subtractive-blueprint-object/297427/2 "2014-10-28T16:46:42Z")

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Hi night\_tig3r\_13,

If you are talking about the BSP additive and subtractive geometry, they can’t be referenced by blueprint and can’t be manipulated at run-time.

However here is one possible solution, you could create a material with Location Based Opacity and add that to a blueprint. Here is a tutorial on how to set that up.

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Another way would be to create the effect in a modeling program by animating it.

TJ

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