[kreativasas]

Hi,
i need to create a hole on a mesh.

I thought to create a cilynder and use some boolean functions like meshdifference etc,

How i can do, is there in powerToys a function to do that?

Thanks

[abenedik]

There is Ab3d.Utilities.MeshBooleanOperations class that can calculate subtraction, addition or intersecion.
See "Advanced 3D objects / Mesh Boolena operations" or "Use cases / Modelling with subtraction" samples in the Ab3d.PowerToys samples project.

[kreativasas]

Ok it works!!
I used Ab3d.Utilities.MeshBooleanOperations.Subtract(modelvisual3d, geometrymesh3d) and i have at least the modelvisual correctly modified with the subtraction.
But a problem qith transformations.
Before using subtract i need to make some translation transformation on modelvisual.
Ofter using subtract the modelvisual losts its transformation and retuns in the original place (before transformations)

Why???

[kreativasas]

ok solved.
It needs to reset transformation after boolean subtract

[kreativasas]

Hi.... another problem.

I understand how create a hole on a mesh, using subtract (i have a mesh and a cylinder, i subtract the cylinder from the mesh and all works).

But i need to create a hole on multiple very similar meshes.
so:
 - I load with assimp the first mesh
- apply the necessary transformation to geometrymodel  (to move the model over the cylinder)
 - i use Ab3d.Utilities.MeshBooleanOperations.Subtract(geometrymodel,meshgeometry)
- the geometrymodel resuts ok with the necessary hole
but when i load the next model, i move over the cylindre (like the first one) the subtract retuns: "Reference to an object not set to an object instance"

using subtract on 10 similar models the error appears random 1 o 2 times.....
anybody can help me?

note that the models are very similar and there is no reason to fail the subtract!!