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feat: add OBJ input support #3

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Merged
alexchuber merged 2 commits into from
Sep 10, 2026
Merged

feat: add OBJ input support #3

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7596e47
feat: add OBJ input support
alexchuber Sep 10, 2026
d7944a3
test: trim OBJ integration coverage
alexchuber Sep 10, 2026
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5 changes: 5 additions & 0 deletions docs/usage.md
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,11 @@ Named by noun.
- Output: output (BabylonScene)
- Resources: Babylon glTF loader
- Behavior: Uses the Babylon scene loader to load a glTF using NullEngine.
- `ObjInputBlock`
- Input: `string` which is a URL (HTTPS or data) that points to an OBJ file.
- Output: output (BabylonScene)
- Resources: Babylon OBJ loader
- Behavior: Uses the Babylon scene loader to load an OBJ using NullEngine. For HTTP(S) OBJ URLs, referenced MTL files and supported relative textures are fetched automatically and embedded before loading. Data-URI OBJ inputs must be self-contained; relative MTL or texture references require an HTTP(S) base URL.
- `StlInputBlock`
- Input: `string` which is a URL (HTTPS or data) that points to an STL file.
- Output: output (BabylonScene)
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16 changes: 3 additions & 13 deletions src/blocks/gltfInputBlock.ts
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Expand Up @@ -2,7 +2,7 @@ import { Block, type BlockOptions } from "../block/block";
import { defineBlock } from "../block/blockDefinition";
import { BabylonSceneType, UrlType } from "../block/connectionPointType";
import { NullEngineResource } from "../resources/nullEngineResource";
import { fetchOrThrowAsync, isHttpUrl, loadSceneWithPluginAsync, toBase64 } from "../helpers/loadSceneWithPlugin";
import { fetchAsDataUriAsync, fetchOrThrowAsync, isHttpUrl, loadSceneWithPluginAsync } from "../helpers/loadSceneWithPlugin";

const GltfInputBlockDefinition = /* @__PURE__ */ defineBlock({
type: "input.gltf",
Expand All @@ -28,7 +28,8 @@ const GltfInputBlockDefinition = /* @__PURE__ */ defineBlock({
name: new URL(resolvedUrl).pathname.split("/").pop() ?? "",
pluginOptions: {
gltf: {
preprocessUrlAsync: (dependencyUrl) => fetchAsDataUriAsync(dependencyUrl, abortController.signal),
preprocessUrlAsync: (dependencyUrl) =>
isHttpUrl(dependencyUrl) ? fetchAsDataUriAsync(dependencyUrl, abortController.signal) : Promise.resolve(dependencyUrl),
},
},
});
Expand Down Expand Up @@ -105,14 +106,3 @@ function isGltfJson(json: string): boolean {
return false;
}
}

async function fetchAsDataUriAsync(url: string, signal: AbortSignal): Promise<string> {
if (!isHttpUrl(url)) {
return url;
}

const response = await fetchOrThrowAsync(url, signal);
const contentType = response.headers.get("content-type")?.split(";", 1)[0] || "application/octet-stream";
const data = new Uint8Array(await response.arrayBuffer());
return `data:${contentType};base64,${toBase64(data)}`;
}
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