3D Geometry Builder at runtime

Graphics
1

I’m looking for a library with which I can create 3d shapes at runtime and render them in MonoGame. These shapes cannot be pre-built and just loaded as an asset, they must be created dynamically. It should support basic operations like Merge, Intersect, Subtract.

Let’s say I want to create a cube with a spherical cut-out. Visual example

The code could look something like this (simplified):

builder.Add(new Cube(x, y, z, w, h, d))
builder.Subtract(new Sphere(x, y, z, r))
builder.Triangulate();
// ....
GraphicsDevice.DrawUserIndexedPrimitives(....) // use builder output as parameters

Performance is not a huge concern, I won’t create a million slightly different shapes, but rather a few specific visible shapes at a time that can only be known at runtime.

Can you recommend / do you have experience with a library which is suited for MonoGame? It doesn’t have to be MonoGame-specific as long as the “conversion” from its output to commands like .DrawUserIndexedPrimitives() is possible

1 Like
2

I have a nuget package for primatives. Im on my phone and cooking dinner so cant get the exact name, but search in the package manager for randomchaos.monogame. and you shoukd find it.

[Edit]
Just got the link to my package Randomchaos.MonoGame.Primitives3D

Hope it helps.

Also, just read the rest of your post, no merge, subtract etc functionality, but something i will probably now add later :slight_smile:
[/Edit]

3

I found a good library for this in 2D (Clipper2), but I don’t know any offhand for 3D. I did some quick googling though and found these… maybe they will help?

3 Likes
4

Thanks, I didn’t know this technique was called CSG! Good resources, now I found some others as well which will be helpful.