Create a node system

[PavelBlend]

I can help create a node system for taichi_blend. @archibate can you tell which nodes are needed? I need a list of nodes and a list of their sockets.

[archibate]

Thank for your help! Here's the possibilities I've thought for taichi field operations:

Socket types

Field

Field storage (ti.field, ti.Vector.field, ti.Matrix.field).
Can write or read.

Sampler

Like field, but read-only, can't be write.
Field sockets can be treated as sampler too.

Note: Field/sampler sockets with different shapes should not be connected directly.

Value

Non-field values, can be scalar / vector / matrix.

Note: scalars / vectors / matrices with different dimensions should not be connected directly.

Nodes

Categories: Input, Output, Storage, Sampler, Gather, Scatter, Physics.

FieldStorage

Declares a field for storage.
Category: Storage
Inputs: N/A
Options: field shape, sparse layouts, data type (float, int, ...), matrix dimension (n and m)
Outputs: the field

SceneInputs

Get the informations of current scene.
Category: Input
Inputs: N/A
Outputs: current frame number, etc.

StoreSamples

Sample a sampler, store it into a r/w field storage of same shape (for buffering purpose).
Category: Storage
Inputs: the sampler
Outputs: the field

ConstantSampler

A sampler that always return the constant.
Category: Sampler
Inputs: the constant value
Options: sampler shape, data type (float, int, ...), matrix dimension (n and m)
Output: a sampler

IndexSampler

A sampler that always return the acquired index.
Category: Sampler
Inputs: the constant value
Options: sampler shape
Output: a sampler

FieldwiseOp

Category: Sampler
Inputs: lhs sampler, rhs sampler
Options: operation type (add, sub, mul...)
Outputs: result sampler

GaussianBlur

Category: Gather
Inputs: a 2D or 3D sampler, the blur radius value
Outputs: result field storage

BilerpSampler

Category: Gather
A sampler that bilerps / trilerps the input 2D / 3D sampler, to a different shape
Inputs: the input sampler
Options: output sampler shape
Output: a sampler with the new shape

SamplerMapIndices

Category: Sampler
A sampler that revamps the index into a specific sampler
Inputs: the input sampler, the index sampler
Output: the indiced result sampler

FieldUpdate

Category: Storage
Update the sampler result to field storage on each substep.
Inputs: a sampler, a field storage
Outputs: still the field storage (for convinence of appending more nodes to it)

ParticleForwardEuler

Category: Physics
Integrate particles using the forward-euler explicit method.
Inputs: particle position sampler, particle velocity sampler
Outputs: the particle position sampler.

GridProjection

Category: Physics
Project grid velocity field to be zero-diversity eulerian fluid.
Inputs: gravity sampler
Outputs: the particle position sampler.

ParticlesToGrid

Category: Scatter
Scatter particles attributes (like pos, vel, mass) to a destination field (p2g in taichi_elements).
Inputs: particle attribute sampler, grid field storage
Options: stencil type (B-spline, etc.)
Outputs: the grid field storage

GridToParticles

Category: Gather
Gather particles attributes (like pos, vel, mass) from a destination field (g2p in taichi_elements).
Inputs: grid sampler, particle attribute field storage
Options: stencil type (B-spline, etc.)
Outputs: the grid field storage

VoxelizeParticles

Category: Scatter
Inputs: particle position sampler, weight per particle scalar
Options: stencil type (gaussian, etc.)
Outputs: the voxel field storage

MarchingCube

Category: Mesh
Marching voxels into mesh of iso faces.
Inputs: voxel sampler, mesh verts field storage, faces field storage
Outputs: mesh verts field storage, faces field storage

MeshVisualize

Category: Output
Visualize a mesh in Blender viewport
Inputs: mesh verts sampler, faces sampler
Options: output mesh sequence to which Blender object
Outputs: N/A

PointCloudVisualize

Category: Output
Visualize a point cloud in Blender viewport
Inputs: particle position sampler
Options: output mesh sequence to which Blender object
Outputs: N/A

[archibate]

Btw, I also want to intergrate my renderer taichi_three, which already have a node-alike system for materials and post-processing, see examples/hdr_blooming.py for example.

[PavelBlend]

@archibate Can you still tell me which categories to create for the nodes?

What categories should I put the nodes into?

[archibate]

Oh I see! Sorry for my ignorance, just added Category: for each node in the previous comment.

[PavelBlend]

@archibate I made ui nodes. Can you check it for correctness? If you need to change something, then say I will.
ebf86c0

tomorrow I will write the code that is responsible for collecting information from the node tree.

[archibate]

Thank for the amazing speed! Some questions:

The Field Shape here shouldn't be a single value, but a tuple instead. For example: (), (42, ), (23, 45), (77, 88, 99). The same to Matrix Dimension.
Is this possible for the blender UI? Thank in advance!

[melMass]

Is there a reason why this was removed? I can't find references to it but the video tutorials make use of it.
thanks

[Calsia]

Is there a reason why this was removed? I can't find references to it but the video tutorials make use of it. thanks

maybe you should select it. hope it's not too late,

[melMass]

maybe you should select it. hope it's not too late,

It's not thanks a lot!!