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104 lines
5.0 KiB
Python
104 lines
5.0 KiB
Python
"""Which CAD face of the Steam Frame controller belongs to which part (button, trigger...).
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Valve's STEP files are one fused solid per controller with no colours, so parts are found
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from the geometry of each CAD face. Coordinates are Valve's CAD frame in millimetres:
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the faceplate faces +Z, the handle runs toward -Y/-Z, the trigger sits at +Y under the
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faceplate. The rules are written for the right controller; the left is mirrored in X.
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The trigger and grip button were picked by hand as CAD face ids on the right controller
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(they share their outline with the body, so simple rules didn't separate them cleanly);
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the left controller's faces are found by mirroring those and matching the nearest face.
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If Valve publishes a new CAD revision, re-check these with a render before trusting them.
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"""
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import json
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import numpy as np
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# Order matters: the index is what models.js stores per vertex, and the stick must be 1
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# (the shader tilts part 1). Keep in sync with src/core/page/controllers/config.js colours.
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PARTS = ['body', 'stick', 'btnA', 'btnB', 'btnX', 'btnY', 'dpad', 'menu', 'system', 'trigger', 'grip', 'door']
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P = {name: i for i, name in enumerate(PARTS)}
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# Right controller CAD face ids (from the 2026-09-26 STEP release).
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GRIP_FACES_R = [25, 26, 29, 30, 31, 32, 464, 466, 467, 468, 469, 474, 482, 483]
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TRIGGER_FACES_R = [392, 393, 394, 395, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 409, 410,
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411, 412, 413, 414, 415, 416, 417, 418, 423, 424, 425, 426, 427, 429, 430, 431, 433, 434,
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435, 436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450]
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def load_mesh(path):
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"""occt-import-js JSON -> (vertices, normals, triangles, CAD face id per triangle)."""
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m = json.load(open(path))['meshes'][0]
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v = np.array(m['attributes']['position']['array'], float).reshape(-1, 3)
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n = np.array(m['attributes']['normal']['array'], float).reshape(-1, 3)
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tris = np.array(m['index']['array'], int).reshape(-1, 3)
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face = np.full(len(tris), -1)
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for k, bf in enumerate(m['brep_faces']):
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face[bf['first']:bf['last'] + 1] = k
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return v, n, tris, face
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def face_stats(v, tris, face):
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"""Area-weighted centroid, average normal and area of every CAD face."""
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t = v[tris]
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c = t.mean(1)
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cr = np.cross(t[:, 1] - t[:, 0], t[:, 2] - t[:, 0])
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area = np.linalg.norm(cr, axis=1) / 2
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F = face.max() + 1
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fc, fn, fa = np.zeros((F, 3)), np.zeros((F, 3)), np.zeros(F)
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np.add.at(fc, face, c * area[:, None])
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np.add.at(fn, face, cr)
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np.add.at(fa, face, area)
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fc /= np.maximum(fa, 1e-9)[:, None]
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fn /= np.linalg.norm(fn, axis=1, keepdims=True) + 1e-9
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return fc, fn, fa
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def _faceplate_parts(fc, fa, side):
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"""Rule-based parts on the faceplate (everything except trigger and grip)."""
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s = 1 if side == 'R' else -1
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x, y, z = fc[:, 0] * s, fc[:, 1], fc[:, 2] # mirrored into the right-hand frame
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out = np.zeros(len(fc), int) # everything starts as 'body' (index 0)
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near = lambda cx, cy: np.hypot(x - cx, y - cy) # distance from a point on the faceplate
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# Each rule: faces whose centre is within a radius of a spot (or inside a box) on the
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# faceplate, and high enough in z to be on the surface rather than inside the shell.
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out[(near(-13.1, -10.2) < 6.5) & (z > -1.0)] = P['stick']
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if side == 'R': # diamond of four face buttons
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for name, (cx, cy) in {'btnA': (14.9, -12.1), 'btnB': (24.0, -3.2),
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'btnX': (6.0, -3.2), 'btnY': (14.9, 5.7)}.items():
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out[(near(cx, cy) < 4.3) & (z > -1.7)] = P[name]
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else: # D-pad
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out[(np.abs(x - 14.9) < 12.5) & (np.abs(y + 3.2) < 12.5) & (z > -1.0) & (fa < 500)] = P['dpad']
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out[(np.abs(x + 0.6) < 5.6) & (np.abs(y - 9.4) < 3.0) & (z > -1.0)] = P['menu']
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out[(near(3.8, -23.7) < 4.7) & (z > -3.0) & (fa < 100)] = P['system']
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return out
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def _mirror_match(ids, fc, fa, ref):
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"""Right-controller face ids -> matching face ids on the left controller."""
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rc, ra = ref
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mirrored = fc * np.array([-1, 1, 1])
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out = []
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for k in ids:
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d = np.linalg.norm(mirrored - rc[k], axis=1) + 0.02 * np.abs(fa - ra[k])
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j = int(np.argmin(d))
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if d[j] < 1.5:
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out.append(j)
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return out
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def classify(fine_mesh_path, side, right_fine_mesh_path):
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"""Part index for every CAD face of one controller. side: 'R' or 'L'."""
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v, _, tris, face = load_mesh(fine_mesh_path)
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fc, _, fa = face_stats(v, tris, face)
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parts = _faceplate_parts(fc, fa, side)
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if side == 'R':
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grip, trigger = GRIP_FACES_R, TRIGGER_FACES_R
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else:
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rv, _, rt, rf = load_mesh(right_fine_mesh_path)
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rc, _, ra = face_stats(rv, rt, rf)
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grip, trigger = _mirror_match(GRIP_FACES_R, fc, fa, (rc, ra)), _mirror_match(TRIGGER_FACES_R, fc, fa, (rc, ra))
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parts[trigger] = P['trigger']
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parts[grip] = P['grip']
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return parts
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