How to prevent ring overlap with a 3D material?

Lethn

I'm now experimenting with vertices code to see if I can finish off the functional side of this effect that I'm working on while I think about how to neaten up the way the shader and viewport is behaving. Do I need to do something extra to grab the vertices of the mesh I'm editing for this to work? I'm getting an error.

extends MeshInstance

func  _ready():
	SetVerticesPositions()
	

func SetVerticesPositions():
	var mesh = ArrayMesh.new()
	var meshDataTool = MeshDataTool.new()
	
	meshDataTool.set_vertex(0, Vector3(0, 100, 0))

E 0:00:00.579 set_vertex: Index p_idx = 0 is out of bounds (vertices.size() = 0).
<C++ Source> scene/resources/mesh_data_tool.cpp:355 @ set_vertex()
<Stack Trace> CylinderMeshVerticesPosition.gd:11 @ SetVerticesPositions()
CylinderMeshVerticesPosition.gd:4 @ _ready()

I'm just trying to get a vertices to change position at the moment, nothing too complex as of yet, I'm wanting to grab individual vertices on the mesh and edit them.

Tomcat

This doesn't happen to be the right one, does it?

Lethn

Oh I've already got the effect just about now if you check the video I uploaded, it's just the way the quad is behaving that I need to tweak as well as a bit of zfighting I think. Now I'm looking at vertices positions and I'm going to use raycasts to position them on the ground. FIrst though I just need to experiment with how to even move the vertices in code using the MeshDataTool. I had a look at that solution awhile ago but it's 2D only and I wanted my outline to be properly 3D which I've achieved.

cybereality

I think Godot 4.0 has decal support, which will make this vastly easier. It would also be easier if you used 2D textures instead of 3D models (that would avoid the inconsistent border width).

Lethn

Well that would be a welcome change, I'll keep tweaking things on 3.5 though, I've got some functional navmesh stuff as a result of that patch which has already made my life a hell of a lot easier in terms of functional game mechanics.

Lethn

@cybereality by the way I was just wondering, is there any kind of explanation of decals for 4.0 already up that I can read through?

Lethn

Oh you guys will love this, it turns out that the reason for the strange rotation and movement happening with the rings was I'm fairly certain because I duplicated the camera and it had one of my groups on that some of my code might have been accessing. There was definitely some weirdness going on as a result of that I think, now it's just a matter of re-adjusting the quad so it fits the the camera properly without warping the scale too much.

Tomcat

Here's a similar one in 3D:

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