diff --git a/src/loader/GLTFLoader.ts b/src/loader/GLTFLoader.ts
index 9a020c4..671a65c 100644
--- a/src/loader/GLTFLoader.ts
+++ b/src/loader/GLTFLoader.ts
@@ -334,7 +334,7 @@ export class GLTF {
 			weights = accessor.getArray();
 		}
 		const geo = new Geometry({ type: "pbrGeomtry" });
-		if (indices) geo.setIndice(Array.from(indices));
+		if (indices) geo.setIndice(indices);
 		if (positions) geo.setAttribute(new Float32Attribute("position", Array.from(positions), 3));
 		if (normals) geo.setAttribute(new Float32Attribute("normal", Array.from(normals), 3));
 		if (colors) geo.setAttribute(new Float32Attribute("color", Array.from(colors), colorSize));
diff --git a/src/render/IndexBuffer.ts b/src/render/IndexBuffer.ts
index c08edab..1fc2e0b 100644
--- a/src/render/IndexBuffer.ts
+++ b/src/render/IndexBuffer.ts
@@ -1,19 +1,21 @@
 import { IndexFormat } from "../core/WebGPUConstant";
 import Buffer from "./Buffer";
+import {TypedArray} from "../utils/gltfUtils";
 export default class IndexBuffer {
 	buffer: Buffer;
-	indices: Array<number>;
+	indices: TypedArray;
 	indexFormat: GPUIndexFormat;
 	dirty: boolean;
 	private label: string;
-	constructor(label: string, indices?: Array<number>) {
+	constructor(label: string, indices?: TypedArray) {
 		this.label = label;
 		this.indices = indices;
-		this.indexFormat = IndexFormat.Uint16;
+		this.indexFormat = indices instanceof Uint32Array ? IndexFormat.Uint32 : IndexFormat.Uint16;
 		this.dirty = true;
 	}
 	setIndices(indices) {
 		this.indices = indices;
+		this.indexFormat = indices instanceof Uint32Array ? IndexFormat.Uint32 : IndexFormat.Uint16;
 		this.dirty = true;
 	}
 	bind(device: GPUDevice, passEncoder: GPURenderPassEncoder) {
@@ -22,8 +24,9 @@ export default class IndexBuffer {
 			this.buffer = Buffer.createIndexBuffer(
 				this.label,
 				device,
-				this.indexFormat == IndexFormat.Uint16 ? new Uint16Array(this.indices) : new Uint32Array(this.indices)
-			);
+				this.indices instanceof Array ?
+					(IndexFormat.Uint16 ? new Uint16Array(this.indices) : new Uint32Array(this.indices)):
+					this.indices);
 		}
 		passEncoder.setIndexBuffer(this.buffer.gpuBuffer, this.indexFormat);
 	}
diff --git a/src/utils/gltfUtils.ts b/src/utils/gltfUtils.ts
index 00be75f..6f36eaf 100644
--- a/src/utils/gltfUtils.ts
+++ b/src/utils/gltfUtils.ts
@@ -45,7 +45,15 @@ export function toIndices(array: TypedArray): Uint16Array | Uint32Array {
 	if (array instanceof Float32Array) {
 		toArray = new Uint32Array(array.length);
 	} else {
-		toArray = new Uint16Array(array.length);
+		let max = 0;
+		for (let i = 0; i < array.length; i++) {
+			max = max < array[i] ? array[i] : max;
+		}
+		if (max < 65536) {
+			toArray = new Uint16Array(array.length);
+		} else {
+			toArray = new Uint32Array(array.length);
+		}
 	}
 	array.forEach((element, index) => {
 		toArray[index] = element;