Turn stl importer into plugin

2019-12-25 13:00:22 +01:00
parent e0f79fe80d
commit 318b034019
6 changed files with 76 additions and 87 deletions
@@ -0,0 +1,74 @@
+
+let import_stl = function(path, done) {
+	iron.Data.getBlob(path, function(b) {
+		let input = new arm.BytesInput(b.bytes);
+		let header = input.read(80);
+		if (header.getString(0, 5) == "solid") {
+			return; // ascii not supported
+		}
+		let faces = input.readInt32();
+		let posTemp = new Float32Array(faces * 9);
+		let norTemp = new Float32Array(faces * 3);
+		for (let i = 0; i < faces; ++i) {
+			let i3 = i * 3;
+			norTemp[i3    ] = input.readFloat();
+			norTemp[i3 + 1] = input.readFloat();
+			norTemp[i3 + 2] = input.readFloat();
+			let i9 = i * 9;
+			posTemp[i9    ] = input.readFloat();
+			posTemp[i9 + 1] = input.readFloat();
+			posTemp[i9 + 2] = input.readFloat();
+			posTemp[i9 + 3] = input.readFloat();
+			posTemp[i9 + 4] = input.readFloat();
+			posTemp[i9 + 5] = input.readFloat();
+			posTemp[i9 + 6] = input.readFloat();
+			posTemp[i9 + 7] = input.readFloat();
+			posTemp[i9 + 8] = input.readFloat();
+			input.readInt16(); // attribute
+		}
+
+		let scalePos = 0.0;
+		for (let i = 0; i < posTemp.length; ++i) {
+			let f = Math.abs(posTemp[i]);
+			if (scalePos < f) scalePos = f;
+		}
+		let inv = 32767 * (1 / scalePos);
+
+		let verts = posTemp.length / 3;
+		let posa = new Int16Array(verts * 4);
+		let nora = new Int16Array(verts * 2);
+		let inda = new Uint32Array(verts);
+		for (let i = 0; i < verts; ++i) {
+			posa[i * 4    ] =  posTemp[i * 3    ] * inv;
+			posa[i * 4 + 1] = -posTemp[i * 3 + 2] * inv;
+			posa[i * 4 + 2] =  posTemp[i * 3 + 1] * inv;
+			nora[i * 2    ] =  norTemp[i    ] * 32767;
+			nora[i * 2 + 1] = -norTemp[i + 2] * 32767;
+			posa[i * 4 + 3] =  norTemp[i + 1] * 32767;
+			inda[i] = i;
+		}
+
+		let name = path.split("\\").pop().split("/").pop().split(".").shift();
+		done({
+			name: name,
+			posa: posa,
+			nora: nora,
+			inda: inda,
+			scale_pos: scalePos,
+			scale_tex: 1.0
+		});
+
+		iron.Data.deleteBlob(path);
+	});
+}
+
+let plugin = new arm.Plugin();
+let formats = arm.Path.meshFormats;
+let importers = arm.Path.meshImporters;
+formats.push("stl");
+importers.h["stl"] = import_stl;
+
+plugin.delete = function() {
+	formats.splice(formats.indexOf("stl"), 1);
+	importers.h["stl"] = null;
+};