luboslenco
81 lines
2.0 KiB
JavaScript
81 lines
2.0 KiB
JavaScript
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let pos = 0;
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function read_i16(view) {
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let i = view.getInt16(pos, true);
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pos += 2;
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return i;
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}
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function read_i32(view) {
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let i = view.getInt32(pos, true);
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pos += 4;
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return i;
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}
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function read_f32(view) {
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let f = view.getFloat32(pos, true);
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pos += 4;
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return f;
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}
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function import_stl(path) {
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let b = data_get_blob(path);
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let view = new DataView(b);
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pos = 0;
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pos += 80; // header
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let faces = read_i32(view);
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let pos_temp = new Float32Array(faces * 9);
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let nor_temp = new Float32Array(faces * 3);
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for (let i = 0; i < faces; ++i) {
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let i3 = i * 3;
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nor_temp[i3 ] = read_f32(view);
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nor_temp[i3 + 1] = read_f32(view);
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nor_temp[i3 + 2] = read_f32(view);
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let i9 = i * 9;
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pos_temp[i9 ] = read_f32(view);
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pos_temp[i9 + 1] = read_f32(view);
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pos_temp[i9 + 2] = read_f32(view);
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pos_temp[i9 + 3] = read_f32(view);
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pos_temp[i9 + 4] = read_f32(view);
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pos_temp[i9 + 5] = read_f32(view);
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pos_temp[i9 + 6] = read_f32(view);
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pos_temp[i9 + 7] = read_f32(view);
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pos_temp[i9 + 8] = read_f32(view);
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read_i16(view); // attribute
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}
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let scale_pos = 0.0;
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for (let i = 0; i < pos_temp.length; ++i) {
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let f = Math.abs(pos_temp[i]);
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if (scale_pos < f) {
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scale_pos = f;
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}
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}
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let inv = 32767 * (1 / scale_pos);
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let verts = pos_temp.length / 3;
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let posa = new Int16Array(verts * 4);
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let nora = new Int16Array(verts * 2);
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let inda = new Uint32Array(verts);
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for (let i = 0; i < verts; ++i) {
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posa[i * 4 ] = pos_temp[i * 3 ] * inv;
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posa[i * 4 + 1] = -pos_temp[i * 3 + 2] * inv;
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posa[i * 4 + 2] = pos_temp[i * 3 + 1] * inv;
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nora[i * 2 ] = nor_temp[i ] * 32767;
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nora[i * 2 + 1] = -nor_temp[i + 2] * 32767;
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posa[i * 4 + 3] = nor_temp[i + 1] * 32767;
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inda[i] = i;
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}
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data_delete_blob(path);
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let name = path.split("\\\\").pop().split("/").pop().split(".").shift();
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return plugin_api_make_raw_mesh(name, posa.buffer, nora.buffer, inda.buffer, scale_pos);
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}
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let plugin = plugin_create();
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path_mesh_importers_set("stl", import_stl);
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plugin_notify_on_delete(plugin, function() {
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path_mesh_importers_delete("stl");
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});
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