Hello folks, I’m looking to implement a simple sort interactive painting thing for a single mesh, as in, a user would click and drag, and paint would be applied to the meshes’ texture at the mouse position in a circular shape. Should be straightforward to do a raycast from the camera to the object…

You can use a CanvasTexture with a second material layered over the main material (Update the geometry.groups to ensure both materials work correctly). On pointerdown, use a Raycaster to get the UV coordinates of the intersection. Convert the UV coordinates to canvas pixel positions, draw on the ca…

Sure, as I wrote, that’s the easy part :slight_smile: [image] _jonas: Should be straightforward to do a raycast from the camera to the object with the mesh, and from there get the corresponding uv coordinate on the texture, that’s the easy part I suppose. My question is about projecting the …

[image] _jonas: so that the brush is not stretched like it is in the demo Sorry, I don’t understand what you mean by “not stretched”? AFAIK, unless you’re using some optical illusion technique, the texture will naturally follow the curves of non-planar geometries. Just like in real life, if y…

@manthrax , impressive example as always! After playing around with it, I think I understand what the OP is looking for. When you spray Suzanne’s eyebrow, there’s a curve behind it, but the spray doesn’t seem to apply the texture to the surface behind it. Instead, it’s drawing over the radius around…

Yeah there are a number of approaches for resolving that. I have more advanced versions in commercial work that use a depth buffer and normal buffer to restrict the brush to visible geometry. The technique I developed/used here can be generalized to support painting with textured brushes, and for t…

Sure! Sorry if my description wasn’t accurate enough, to put it in simple terms using the Demo you linked: [Screenshot 2024-12-30 at 11.55.38] Because you are drawing a circle directly on the texture, and that texture is then mapped onto the 3D surface, the circle will be warped as in the screens…

Projecting texture onto mesh and applying result to mesh texture (for mesh painting)

Questions

danzen December 27, 2025, 3:17am 9

There is TextureActive with ZIM

For example:

https://codepen.io/zimjs/pen/dPogxNB

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Projecting texture onto mesh and applying result to mesh texture (for mesh painting)

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