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<script lang="ts">
import { onMount } from "svelte";
import type { FileData } from "@gradio/client";
import type { Viewer, ViewerDetails } from "@babylonjs/viewer";
let BABYLON_VIEWER: typeof import("@babylonjs/viewer");
export let value: FileData;
export let display_mode: "solid" | "point_cloud" | "wireframe";
export let clear_color: [number, number, number, number];
export let camera_position: [number | null, number | null, number | null];
export let zoom_speed: number;
export let pan_speed: number;
$: url = value.url;
let canvas: HTMLCanvasElement;
let viewer: Viewer;
let viewerDetails: Readonly<ViewerDetails>;
let mounted = false;
onMount(() => {
const initViewer = async (): Promise<void> => {
BABYLON_VIEWER = await import("@babylonjs/viewer");
BABYLON_VIEWER.CreateViewerForCanvas(canvas, {
clearColor: clear_color,
useRightHandedSystem: true,
animationAutoPlay: true,
cameraAutoOrbit: { enabled: false },
onInitialized: (details: any) => {
viewerDetails = details;
}
}).then((promiseViewer: any) => {
viewer = promiseViewer;
mounted = true;
});
};
initViewer();
return () => {
viewer?.dispose();
};
});
$: mounted && load_model(url);
function setRenderingMode(pointsCloud: boolean, wireframe: boolean): void {
viewerDetails.scene.forcePointsCloud = pointsCloud;
viewerDetails.scene.forceWireframe = wireframe;
}
function load_model(url: string | undefined): void {
if (viewer) {
if (url) {
viewer
.loadModel(url, {
pluginOptions: {
obj: {
importVertexColors: true
}
}
})
.then(() => {
if (display_mode === "point_cloud") {
setRenderingMode(true, false);
} else if (display_mode === "wireframe") {
setRenderingMode(false, true);
} else {
update_camera(camera_position, zoom_speed, pan_speed);
}
});
} else {
viewer.resetModel();
}
}
}
export function update_camera(
camera_position: [number | null, number | null, number | null],
zoom_speed: number,
pan_speed: number
): void {
const camera = viewerDetails.camera;
if (camera_position[0] !== null) {
camera.alpha = (camera_position[0] * Math.PI) / 180;
}
if (camera_position[1] !== null) {
camera.beta = (camera_position[1] * Math.PI) / 180;
}
if (camera_position[2] !== null) {
camera.radius = camera_position[2];
}
camera.lowerRadiusLimit = 0.1;
const updateCameraSensibility = (): void => {
camera.wheelPrecision = 250 / (camera.radius * zoom_speed);
camera.panningSensibility = (10000 * pan_speed) / camera.radius;
};
updateCameraSensibility();
camera.onAfterCheckInputsObservable.add(updateCameraSensibility);
}
export function reset_camera_position(): void {
if (viewerDetails) {
viewer.resetCamera();
}
}
</script>
<canvas bind:this={canvas}></canvas>
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