12 V to 5 V / 1 A Buck Molecule (TPS54202), built in Altium Designer

@@ -0,0 +1,74 @@+#!/usr/bin/env python3+"""Bake the board's Gerber artwork and real finishes into the Altium board GLB, so any glTF viewer (the wiki's+3D viewer) shows what the renders show.++    bake_board_glb.py <board.glb> <top.png> <bottom.png> <out.glb>++- Materials: the STEP export leaves every material at glTF's default metallicFactor 1.0, so plastic, FR4 and+  silkscreen render as polished metal. Metal only for gold, tin and nickel tones (the render's rule), else+  metallic 0.05; roughness 0.35 for metal, 0.55 otherwise.+- Faces: top.png / bottom.png (textures.py: mask, copper, ENIG openings, silkscreen, holes from the Gerbers and+  drill file) as two alpha-masked quads, 12 um above the board's top face (z 0) and below its bottom face+  (z -0.4115 mm), over the 28 x 20 mm outline. bottom.png is already mirrored for viewing from below.+"""+import struct, sys+import numpy as np+from pygltflib import GLTF2, Image, Texture, Sampler, Material, PbrMetallicRoughness, TextureInfo, Mesh, Primitive, \+    Attributes, Node, Accessor, BufferView++src, top_png, bot_png, dst = sys.argv[1:5]+W, H, ZT, ZB, EPS = 0.028, 0.020, 0.0, -0.00041148, 0.000012+g = GLTF2().load(src)+blob = bytearray(g.binary_blob())++# materials: real finishes instead of all-metal+for m in g.materials:+    r, gg, b = m.pbrMetallicRoughness.baseColorFactor[:3]+    metal = (r > 0.55 and gg > 0.35 and b < 0.3) or (r > 0.5 and abs(r - gg) < 0.06 and abs(gg - b) < 0.08 and r < 0.8)+    m.pbrMetallicRoughness.metallicFactor = 0.85 if metal else 0.05+    m.pbrMetallicRoughness.roughnessFactor = 0.35 if metal else 0.55+++def add(data, target=None):+    while len(blob) % 4:+        blob.append(0)+    off = len(blob); blob.extend(data)+    g.bufferViews.append(BufferView(buffer=0, byteOffset=off, byteLength=len(data), target=target))+    return len(g.bufferViews) - 1+++def quad(z, normal_z, flip_u, img_bytes, name):+    # corners (x, y): u runs along x (reversed on the bottom, which the texture already mirrors), glTF v = 0 at the image top+    xy = [(0, 0), (W, 0), (W, H), (0, H)]+    pos = np.array([[x, y, z] for x, y in xy], np.float32)+    nrm = np.array([[0, 0, normal_z]] * 4, np.float32)+    uv = np.array([[(1 - x / W) if flip_u else x / W, 1 - y / H] for x, y in xy], np.float32)+    idx = np.array([0, 1, 2, 0, 2, 3] if normal_z > 0 else [0, 2, 1, 0, 3, 2], np.uint16)+    acc = []+    for arr, typ, ct, tgt in ((pos, "VEC3", 5126, 34962), (nrm, "VEC3", 5126, 34962), (uv, "VEC2", 5126, 34962), (idx, "SCALAR", 5123, 34963)):+        bv = add(arr.tobytes(), tgt)+        a = Accessor(bufferView=bv, componentType=ct, count=len(arr), type=typ)+        if arr is pos:+            a.min, a.max = pos.min(0).tolist(), pos.max(0).tolist()+        g.accessors.append(a); acc.append(len(g.accessors) - 1)+    g.images.append(Image(bufferView=add(img_bytes), mimeType="image/png", name=name))+    g.samplers = g.samplers or []+    if not g.samplers:+        g.samplers.append(Sampler(magFilter=9729, minFilter=9987, wrapS=33071, wrapT=33071))+    g.textures.append(Texture(source=len(g.images) - 1, sampler=0))+    g.materials.append(Material(name=name, alphaMode="MASK", alphaCutoff=0.5, doubleSided=False,+                                pbrMetallicRoughness=PbrMetallicRoughness(baseColorTexture=TextureInfo(index=len(g.textures) - 1),+                                                                          metallicFactor=0.0, roughnessFactor=0.32)))+    g.meshes.append(Mesh(name=name, primitives=[Primitive(attributes=Attributes(POSITION=acc[0], NORMAL=acc[1], TEXCOORD_0=acc[2]),+                                                          indices=acc[3], material=len(g.materials) - 1)]))+    g.nodes.append(Node(name=name, mesh=len(g.meshes) - 1))+    g.nodes[0].children.append(len(g.nodes) - 1)+++g.images = g.images or []; g.textures = g.textures or []+quad(ZT + EPS, 1, False, open(top_png, "rb").read(), "Board top (mask, copper, silkscreen from the Gerbers)")+quad(ZB - EPS, -1, True, open(bot_png, "rb").read(), "Board bottom (mask, copper, silkscreen from the Gerbers)")+g.buffers[0].byteLength = len(blob)+g.set_binary_blob(bytes(blob))+g.save_binary(dst)+print(dst, len(blob), "bytes buffer;", len(g.materials), "materials,", len(g.meshes), "meshes")

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