Forums Technical Discussion Blast node don't work properly when using expressions

Blast node don't work properly when using expressions

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misakacirno
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I created two box and added the "boxID" attribute to them at the primitive level using the attribute create node, where box1 has a boxID of 0 and box2 has a boxID of 1.
I then merged them and tried to delete the primitive with boxID of 1 using the blast node, but it only deleted one primitive.
How should I solve this problem?

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Enivob
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Hmm, seems to work for me. Maybe you typed the expression wrong?

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Using Houdini Indie 20.0
Windows 11 64GB Ryzen 16 core.
nVidia 3050RTX 8BG RAM.
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lucap1
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You should probably be using the delete sop With delete by expression turned on. Or you can use the group by expression sop and then use that group in the blast sop
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misakacirno
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Enivob
Hmm, seems to work for me. Maybe you typed the expression wrong?
I'm sorry I'm just now seeing your response.
This is indeed the problem, I used 
@boxID = 0
, where Houdini recognizes spaces as separators and thus only removes primitives with number 0.
Thank you for your answer！
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misakacirno
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鲁卡普1
You should probably be using the delete sop With delete by expression turned on. Or you can use the group by expression sop and then use that group in the blast sop
Thank you for your answer! It's just a wrong syntax question about spaces.
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