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bretik

Material Fracture Bullet Glass

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Hi,

I try to make a car glass bullet hit... I can't figure how to make the connected pieces which stay attached to glass, I tried "soft constraint" of the "Material fracture node, but I can't figure how to break the soft constraint in some distance, pieces always returning back no matter how far they are.. which looks more like a STAR GATE portal opening :D 

Sklo_TEST_11.hip

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Hi,

Bullet solver can broke only glue constrain automatically, for the others types of constraints you should use SOP Solver DOP.

Sklo_TEST_11_01.hipnc

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OK, I solved the thing... I'm about to render it.. as a glass.

How are You guys doing this? You have some workaround for this? I mean.. "Material Fracture" is fractured all the way from frame 1. so it's on the render as well.

Is there some way to mix the "uncracked" and "cracked" mesh based on some attribute? What will be the best way to handle this?

On a pictur is frame 1, the cracking starts on Frame 5 or so...Sklo_TEST_22.mantra1_0004.thumb.jpg.7673325caf5a6fc589c3e960aaba9776.jpg

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I think a switch sop with two inputs - cracked and uncracked versions of the geo can handle it.

Edited by vicvvsh

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Thanks Victor... 

But there is going to be like 5 shots hitting the glass... so I need to make some "geometry mask", based on some attribute,

There is something, some attribute "Broken" on the constraints... maybe that's the way. Can't figure it out... :( 

(or I was thinking about converting both do VDB do some " diffrence  mask" and then use this for combining cracked and uncracked mesh ...  ?)

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The other issue I have is that as long as it is on BOX object it looks great... Radial cracks are curvy, but no matter what if You make Material Fracture on imported object or a pig head test geometry or any other. The radial cracks are just straight... as well as concentric cracks...

A_2.thumb.jpg.45c2b7aeb12c2e304a161fb407f8ab27.jpgA1.thumb.jpg.faef7b24a4d8c8b0278d283d2ca663c2.jpg

Edited by bretik

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1 hour ago, bretik said:

The other issue I have is that as long as it is on BOX object it looks great... Radial cracks are curvy, but no matter what if You make Material Fracture on imported object or a pig head test geometry or any other. The radial cracks are just straight... as well as concentric cracks...

Only flat objects currently supported

1 hour ago, bretik said:

Thanks Victor... 

But there is going to be like 5 shots hitting the glass... so I need to make some "geometry mask", based on some attribute,

There is something, some attribute "Broken" on the constraints... maybe that's the way. Can't figure it out... :( 

(or I was thinking about converting both do VDB do some " diffrence  mask" and then use this for combining cracked and uncracked mesh ...  ?)

Maybe shader solution helps you, i don't know... You're using Arnold for rendering but anyway try to read this post:

 

 

Edited by vicvvsh

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oh, ok... I will bend the glass after the sim... 

Don't need to use Arnold... even it will be similar for Arnold... I will check that. Thanks a lot. Bretislav

 

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