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Merge pull request #376 from scipp/new-mesh-3d
Add mesh 3d
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| { | ||
| "cells": [ | ||
| { | ||
| "cell_type": "markdown", | ||
| "id": "0", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "# 3D mesh plot\n", | ||
| "\n", | ||
| "This notebook illustrates how to render 3D meshes\n", | ||
| "by supplying a list of vertex positions and vertex indices to construct the mesh faces." | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "id": "1", | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "import scipp as sc\n", | ||
| "import plopp as pp\n", | ||
| "from plopp.data import examples" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "id": "2", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "## Loading mesh data\n", | ||
| "\n", | ||
| "We load a file containing the data to construct the [Utah teapot](https://en.wikipedia.org/wiki/Utah_teapot)\n", | ||
| "(see below for a description of the data format)." | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "id": "3", | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "dg = sc.io.load_hdf5(examples.teapot())\n", | ||
| "dg" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "id": "4", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "## Creating a mesh plot\n", | ||
| "\n", | ||
| "We can now send the data to the [`mesh3d`](../../generated/plopp.mesh3d.html) function for rendering (we color the mesh according to z position):" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "id": "5", | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "pp.mesh3d(\n", | ||
| " vertices=dg[\"vertices\"],\n", | ||
| " faces=dg[\"faces\"],\n", | ||
| " vertexcolors=dg[\"vertices\"].fields.z,\n", | ||
| ")" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "id": "6", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "## Adding mesh edges\n", | ||
| "\n", | ||
| "It is also possible to show the edges of the mesh using the `edgecolor` argument:" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "id": "7", | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "pp.mesh3d(\n", | ||
| " vertices=dg[\"vertices\"],\n", | ||
| " faces=dg[\"faces\"],\n", | ||
| " vertexcolors=dg[\"vertices\"].fields.z,\n", | ||
| " edgecolor=\"black\",\n", | ||
| ")" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "id": "8", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "## The data format\n", | ||
| "\n", | ||
| "The data used above contains a list of `vertices` (position vectors in 3d space),\n", | ||
| "and a list of `faces` which define how the vertices are connected to each other.\n", | ||
| "\n", | ||
| "The faces is a flat list of sequences of 3 indices that code for vertices which make up mesh triangles.\n", | ||
| "\n", | ||
| "As an example, we will construct a simple tetrahedric mesh." | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "id": "9", | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "vertices = sc.vectors(\n", | ||
| " dims=[\"vertices\"],\n", | ||
| " values=[[-1, 0, 0], [0.7, 0, 1], [0.7, 0, -1], [0, 1.3, 0]],\n", | ||
| " unit=\"m\",\n", | ||
| ")\n", | ||
| "faces = sc.array(\n", | ||
| " dims=[\"faces\"],\n", | ||
| " values=[\n", | ||
| " # First triangle\n", | ||
| " 0, 1, 3,\n", | ||
| " # Second triangle\n", | ||
| " 1, 2, 3,\n", | ||
| " # Third triangle\n", | ||
| " 2, 0, 3,\n", | ||
| " # Fourth triangle\n", | ||
| " 0, 2, 1,\n", | ||
| " ],\n", | ||
| ")\n", | ||
| "\n", | ||
| "pp.mesh3d(\n", | ||
| " vertices=vertices,\n", | ||
| " faces=faces,\n", | ||
| " edgecolor=\"black\",\n", | ||
| ")" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "id": "10", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "You can then also add colors on the vertices:" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "id": "11", | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "pp.mesh3d(\n", | ||
| " vertices=vertices,\n", | ||
| " faces=faces,\n", | ||
| " vertexcolors=vertices.fields.x,\n", | ||
| " edgecolor=\"black\",\n", | ||
| ")" | ||
| ] | ||
| } | ||
| ], | ||
| "metadata": { | ||
| "kernelspec": { | ||
| "display_name": "Python 3 (ipykernel)", | ||
| "language": "python", | ||
| "name": "python3" | ||
| }, | ||
| "language_info": { | ||
| "codemirror_mode": { | ||
| "name": "ipython", | ||
| "version": 3 | ||
| }, | ||
| "file_extension": ".py", | ||
| "mimetype": "text/x-python", | ||
| "name": "python", | ||
| "nbconvert_exporter": "python", | ||
| "pygments_lexer": "ipython3" | ||
| } | ||
| }, | ||
| "nbformat": 4, | ||
| "nbformat_minor": 5 | ||
| } |
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