Add NoiseTexture3D

[Lasuch69]

Implements NoiseTexture3D resource based on existing NoiseTexture2D implementation scaled to third dimension, and modifies it to support custom depth coordinates when generating noise in 3D.

Supports seamless generation, modulation with gradient, and normalization. Lacks mipmap generation because of a bug in core #56066

• Bugsquad edit: This closes Add NoiseTexture3D godot-proposals#4946.

[Calinou]

Tested locally (rebased on latest master), it works for both FogVolume and GPUParticlesAttractorVectorField3D use cases.

Usage notes:

• You may have to increase the fog volume size and volume depth in the advanced Project Settings for noise in fog to be more noticeable. This has a performance impact.
• Remember to use a color ramp with GPUParticlesAttractorVectorField3D, so you can adjust each axis individually. Also increase its strength and increase particles damping, so direction changes are more noticeable on the particles themselves.

Testing project: test_noisetexture3d.zip

[akien-mga]

Thanks! And congrats for your first merged Godot contribution 🎉

[sosasees]

sounds like voxel terrain generation will be slightly easier with NoiseTexture3D

related: my first voxel terrain generation attempt in Godot (4.0 alpha 13)

[Lasuch69]

sounds like voxel terrain generation will be slightly easier with NoiseTexture3D

related: my first voxel terrain generation attempt in Godot (4.0 alpha 13)

Using get_noise_3d will be a better option.

[sosasees]

Using get_noise_3d will be a better option.

i just looked through my voxel project that i mentioned, and i used Noise.get_noise_3dv() to determine if any coordinate should have a block at startup.