Prevent water entering into boat?

Question

I'm new to blender (v2.92.2) and would like to know how to prevent the water from getting to the boat. I have used an Ocean Modifier over a plane to create the ocean and modelled the boat.

When I use the difference bool tool by selecting the boat first and then the ocean, the boat disappears.

When I use the difference bool tool by selecting the ocean first and then the boat, the ocean and part of the boat disappear.

Should I be using something different?

Since answered, just a note to the "disappearing"... BoolTool > Auto Boolean automatically deletes the differenced object (boat) ... in case Bool Tool > Brush Boolean - automatically change Viewport Visibility to type Bounds ... you can make it visible back in Object Properties > Viewport Display — vklidu, Apr 24 '21 at 21:02

score 10 · Answer 1 · answered Apr 24 '21 at 09:10

10

You need to create a proxy mesh which you will not be rendering, that encompasses the body of the boat, then add a boolean modifier set to difference to the ocean and set to use the proxy mesh.

Example :

I duplicate the bowl object, increase the mesh's size so there is overlap in the bottom of the bowl.

Then select the ocean object, add a boolean modifier. Don't forget to set the solver to Fast, the Exact solver is pretty buggy.

Don't forget to parent the proxy mesh to the boat object so that it moves with it, and uncheck all the render properties for the proxy so it doesn't show up in rendered view.

answered Apr 24 '21 at 09:10

Gorgious

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Dang! 7 minutes behind with an identical answer ! >8-|| – Robin Betts Apr 24 '21 at 09:22
@RobinBetts Wups ! You should have let it up and let the crowd decide which one they prefer :) I personaly don't mind at all – Gorgious Apr 24 '21 at 09:35
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Hehe.. not enough difference :) The objective is to help readers, not to win competitions. – Robin Betts Apr 24 '21 at 09:39
Thank you that worked, with the ocean showing some quirks though! Reference image. – Kannan Apr 24 '21 at 12:55
@Kannan you can solve it by enabling auto smooth in the mesh properties, or just adding a solidify modifier should do the trick – Gorgious Apr 24 '21 at 13:39
@Gorgious Thank you very much, that worked! Reference Image – Kannan Apr 25 '21 at 09:36

score 4 · Answer 2 · answered Apr 24 '21 at 08:16

Instead of a Boolean you could try using a Shrinkwrap modifier on the Ocean - set to 'Project' - to move the vertices to the under-surface of the boat.

Select the Ocean and add a Shrinkwrap modifier
Set the Method to 'Project'
Set the Axis to 'Z' and enable Negative
Set the Target to your boat
Ensure the Shrinkwrap is after your Ocean modifier in the modifier stack
Adjust the Offset to fine-tune the intersection

Note that you need to ensure your ocean has sufficient geometry.

Thank you, that worked too, but again ocean is showing some quirks! Reference Image. — Kannan, Apr 24 '21 at 13:15

Prevent water entering into boat?

2 Answers2