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Add InstancedMesh example #187

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e46b241
Add instanced_mesh.html example
siddancha Feb 3, 2025
bebe959
Fix `InstancedBufferAttribute` -> `Float32Array`
siddancha Feb 11, 2025
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168 changes: 168 additions & 0 deletions test/instanced_mesh.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<html>

<head>
<meta charset=utf-8>
<title>MeshCat - InstancedMesh</title>
</head>

<body>
<div id="meshcat-pane">
</div>

<script src="../dist/main.min.js"></script>
<script>
var viewer = new MeshCat.Viewer(document.getElementById("meshcat-pane"));

// Set InstancedMesh object -- a grid of 3x3x3 BoxGeometries
viewer.handle_command({
type: "set_object",
path: "/meshcat/instanced_cubes",
object: {
metadata: { version: 4.5, type: "Object" },
geometries: [
{
uuid: "c2afd88b-ff9e-4408-9b94-b94e2079e2c8",
type: "BoxGeometry",
width: 0.2,
height: 0.2,
depth: 0.2
}
],
materials: [
{
uuid: "a63e3e66-c87a-4826-adee-2cf0fc04bf70",
type: "MeshPhongMaterial",
color: 0xffffff, // white
side: 2,
transparent: true,
opacity: 0.5
}
],
object: {
uuid: "d8497b0e-2529-4c5a-a477-00fc2c815349",
type: "InstancedMesh",
geometry: "c2afd88b-ff9e-4408-9b94-b94e2079e2c8",
material: "a63e3e66-c87a-4826-adee-2cf0fc04bf70",
instanceMatrix: {
type: "Float32Array",
itemSize: 16,
array: [
// Each line is a 4x4 transform matrix of a cube
// The 4x4 matrices are flattened in column-major order

// z = 0 layer
1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.3,0,0,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.6,0,0,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0.3,0,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.3,0.3,0,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.6,0.3,0,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0.6,0,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.3,0.6,0,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.6,0.6,0,1,

// z = 0.3 layer
1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0.3,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.3,0,0.3,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.6,0,0.3,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0.3,0.3,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.3,0.3,0.3,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.6,0.3,0.3,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0.6,0.3,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.3,0.6,0.3,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.6,0.6,0.3,1,

// z = 0.6 layer
1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0.6,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.3,0,0.6,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.6,0,0.6,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0.3,0.6,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.3,0.3,0.6,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.6,0.3,0.6,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0.6,0.6,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.3,0.6,0.6,1,
1,0,0,0, 0,1,0,0, 0,0,1,0, 0.6,0.6,0.6,1
]
},
instanceColor: {
type: "Float32Array",
itemSize: 3,
array: new Float32Array(27 * 3).fill(1) // 27 instances * 3 components (RGB)
},
count: 27
}
}
});

// Set InstancedMesh properties.
// Here, we are updating the colors of the cubes.
viewer.handle_command({
type: "set_property",
path: "/meshcat/instanced_cubes/<object>",
property: "instanceColor.array",
value: new Float32Array([
// z = 0 layer (red)
1,0,0,
1,0,0,
1,0,0,
1,0,0,
1,0,0,
1,0,0,
1,0,0,
1,0,0,
1,0,0,
// z = 0.3 layer (green)
0,1,0,
0,1,0,
0,1,0,
0,1,0,
0,1,0,
0,1,0,
0,1,0,
0,1,0,
0,1,0,
// z = 0.6 layer (blue)
0,0,1,
0,0,1,
0,0,1,
0,0,1,
0,0,1,
0,0,1,
0,0,1,
0,0,1,
0,0,1
])
});

</script>

<style>
body {
margin: 0;
}

#meshcat-pane {
width: 100vw;
height: 100vh;
overflow: hidden;
}

#test-message {
width: 75vw;
text-align: left;
background-color: rgb(232, 232, 232);
position: fixed;
left: 0%;
display: block;
padding: 10px;
}

#status-message {
font-size: large;
font-weight: bold;
}
</style>
</body>

</html>