Add LineViewer node

[hooyuser]

LineViewer node is an output node designed for previewing the colored lines from zeno PrimitiveObject directly in Blender 3DViewport.

A similar way might be used for create some useful overlay in 3DViewport, such as bounding box, vdb hierarchy, sdf ray marching, etc.

[archibate]

I used to use numpy arrays in these cases for dense data, not sure how the difference in perf.

无法顺畅的大口呼吸，是活着的最好证明

---Original--- From: "Derived @.> Date: Mon, Sep 6, 2021 17:03 PM To: @.>; Cc: @.***>; Subject: Re: [zenustech/zenoblend] Add LineViewer node (#9)

@hooyuser commented on this pull request.

In zenoblend/main.cpp: > @@ -162,6 +166,46 @@ PYBIND11_MODULE(pylib_zenoblend, m) { return meshPtr; }); + py::bind_vector<std::vector<float>>(m, "FloatVec3");
This can treat std::vector as a PyObject which behaves like Python internal object list, without really converting it into a list. I guess this will get better performance when dealing with a large buffer. c.f. https://pybind11.readthedocs.io/en/stable/advanced/cast/stl.html#binding-stl-containers

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[hooyuser]

Maybe I should seek for some profiler for performance tuning？For now, I doubt any operation involving copying buffer could be performance bottleneck and these ideas towards optimization are worth considering.

• For buffer cached in zeno graph , should std::vector or numpy array be chosen?
• For Blender API, figure out the best way to prepare the buffer for rendering with blender GPU module. Currently I use batch_for_shader for simplicity, which packs vertex buffer and vertex color buffer into a dict-like object. Creating GPUBatch, GPUIndexBuf, GPUVertBuf objects manually could make a difference (see https://docs.blender.org/api/dev/gpu.types.html)?
• If batch_for_shader is used, should I combine vertex buffer and vertex color buffer into a std::map?

As for GPU optimization, we can offer an option to disable color vertex buffer. And since geometry shader is known for its performance issue, a fallback to simpler shaders without geometry shader may also help in the case of huge data to be drawn.

I guess this as well as other performance profiling task can be a long-term project. I'm working to implement VDBAnalyzer and VDBAdvect Node initially for SDF/LevelSet, LineViewer node is a useful tool for me to visualize the result of these VDB nodes. My initial implementation of LineViewer node may not be very good in performance.

[archibate]

maybe in future static/framed can be a boolean,property of node group, like the 'sverchok' ui you shown in our qq group.

无法顺畅的大口呼吸，是活着的最好证明

---Original--- From: "Derived @.> Date: Thu, Sep 9, 2021 19:38 PM To: @.>; Cc: @.**@.>; Subject: Re: [zenustech/zenoblend] Add LineViewer node (#9)

@hooyuser commented on this pull request.

In zenoblend/node_system.py: > @@ -303,6 +303,15 @@ def draw_buttons(self, context, layout): row.operator("node.zeno_apply", text="Apply") row.operator("node.zeno_stop", text="Stop") +class ZenoNode_LineViewer(def_node_class('LineViewer', [('PrimitiveObject', 'prim', ''), ('bool', 'display:', '1')], [], 'blender')): + '''Zeno specialized LineViewer node''' + + def update(self): # rewrite update function + if bpy.context.scene.zeno.executing: + bpy.ops.node.zeno_apply('EXEC_DEFAULT')
OK, I will check it. In fact, only static nodegroups have been tested so far. I will next test this node for framed/cached nodegroups.

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[hooyuser]

I totally agree. A Sverchok-like UI looks good for me. Btw, have you ever considered adding a TODO project for zenoblend?