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Play animation clips in the 3D viewer #242

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Play animation clips in the 3D viewer #242

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46 changes: 43 additions & 3 deletions src/areas/generate/components/Viewer3D.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ import { Component, Suspense, useCallback, useEffect, useMemo, useRef, useState
import type { ReactNode, ErrorInfo, MutableRefObject } from 'react'
import { Canvas, useFrame, useLoader, useThree } from '@react-three/fiber'
import type { ThreeEvent } from '@react-three/fiber'
import { Environment, GizmoHelper, Lightformer, OrbitControls, useGizmoContext, useGLTF } from '@react-three/drei'
import { Environment, GizmoHelper, Html, Lightformer, OrbitControls, useGizmoContext, useGLTF } from '@react-three/drei'
import { EffectComposer, Outline, Select, Selection } from '@react-three/postprocessing'
import * as THREE from 'three'
import { OBJLoader } from 'three/examples/jsm/loaders/OBJLoader.js'
Expand Down Expand Up @@ -151,8 +151,48 @@ function MeshModel({ url, jobId, viewMode, selected, onStats, onSelect, onObject
}

function GltfMeshModel(props: MeshModelProps): JSX.Element {
const { scene } = useGLTF(props.url)
return <SceneMeshModel {...props} scene={scene} loaderType="gltf" />
const gltf = useGLTF(props.url)
const { scene, animations } = gltf
const mixerRef = useRef<THREE.AnimationMixer | null>(null)
const [clipIndex, setClipIndex] = useState(0)

// Rigged models arrive with one or more clips; without a mixer they render
// frozen in bind pose, which reads as "the rig failed".
useEffect(() => {
if (!animations?.length) {
mixerRef.current = null
return
}
const mixer = new THREE.AnimationMixer(scene)
mixer.clipAction(animations[Math.min(clipIndex, animations.length - 1)]).play()
mixerRef.current = mixer
return () => {
mixer.stopAllAction()
mixer.uncacheRoot(scene)
mixerRef.current = null
}
}, [scene, animations, clipIndex])

useFrame((_state, delta) => mixerRef.current?.update(delta))

return (
<>
<SceneMeshModel {...props} scene={scene} loaderType="gltf" />
{animations && animations.length > 1 && (
<Html position={[0, 0, 0]} wrapperClass="clip-picker">
<select
value={clipIndex}
onChange={(e) => setClipIndex(Number(e.target.value))}
className="bg-zinc-800 text-zinc-200 border border-zinc-700 rounded px-2 py-1 text-xs"
>
{animations.map((clip, i) => (
<option key={clip.name || i} value={i}>{clip.name || }</option>
))}
</select>
</Html>
)}
</>
)
}

function ObjMeshModel(props: MeshModelProps): JSX.Element {
Expand Down