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# model_pokeball_scaled.py
import trimesh
import json
import numpy as np
PI = np.pi
# === 你可以调这些参数（contact默认放在物体OBB质心，可加偏移） ===
MODEL_SCALE = 0.04 # 几何整体缩放
MARKER_FRAC = 0.1 # 标注物相对尺寸(基于OBB对角线)
CONTACT_POS = (0.0, 0.0, 0.0) # contact 相对OBB质心的偏移(世界系)
CONTACT_RPY = (0.0, 0.0, 0.0) # contact 欧拉角(XYZ顺序), 单位: 弧度
CONTACT_RADIUS_SCALE = 1.0 # contact 球半径系数(相对于默认 r = diag*MARKER_FRAC*1.0)
AXIS_ORIGIN_SIZE_SCALE = 1.0 # contact处坐标轴的“轴心球”尺寸缩放
def create_model_data(id="pokeball"):
file_path = f"./{id}.glb"
save_path = f"./model_data.json"
# 1) 读模型并烘焙为单一 Trimesh
with open(file_path, "rb") as f:
loaded = trimesh.load(f, file_type="glb")
mesh = loaded.to_mesh() if isinstance(loaded, trimesh.Scene) else loaded
# 2) 缩放
mesh.apply_scale(MODEL_SCALE)
scene = trimesh.Scene(mesh)
# 3) 尺寸 & 标注尺度
obb = mesh.bounding_box_oriented
center = np.asarray(obb.centroid)
ext = np.asarray(obb.extents)
diag = float(np.linalg.norm(ext)) + 1e-12
axis_len = diag * MARKER_FRAC * 6.0
origin_sz = diag * MARKER_FRAC * 0.6
r_target = diag * MARKER_FRAC * 1.2
r_contact = diag * MARKER_FRAC * 1.0 * float(CONTACT_RADIUS_SCALE)
red = [1.0, 0.0, 0.0, 0.5]
green = [0.0, 1.0, 0.0, 0.5]
# 4) Target point：OBB 质心
target_sphere = trimesh.creation.icosphere(subdivisions=2, radius=r_target)
T_target = trimesh.transformations.translation_matrix(center)
target_sphere.apply_transform(T_target)
target_sphere.visual.vertex_colors = np.array([red] * len(target_sphere.vertices))
scene.add_geometry(target_sphere)
target_points_list = [T_target.tolist()]
# 5) contact：默认放在球中心(OBB质心)，可用CONTACT_POS作小偏移
contact_sphere = trimesh.creation.icosphere(subdivisions=2, radius=r_contact)
contact_world_pos = center + np.asarray(CONTACT_POS, dtype=float)
T_contact = (
trimesh.transformations.translation_matrix(contact_world_pos) @
trimesh.transformations.euler_matrix(*CONTACT_RPY)
)
contact_sphere.apply_transform(T_contact)
contact_sphere.visual.vertex_colors = np.array([red] * len(contact_sphere.vertices))
# 可视化局部坐标轴
axis = trimesh.creation.axis(origin_size=origin_sz * float(AXIS_ORIGIN_SIZE_SCALE))
axis.apply_transform(T_contact)
scene.add_geometry(axis)
scene.add_geometry(contact_sphere)
contact_points_list = [T_contact.tolist()]
contact_desc = ["Single contact at OBB centroid (+ offset)."]
# 6) Orientation 参考点（仍放 OBB +Y 顶端）
if hasattr(obb, "primitive") and hasattr(obb.primitive, "transform"):
R_obb = np.asarray(obb.primitive.transform)[:3, :3]
else:
R_obb = np.eye(3)
orient = trimesh.creation.icosphere(subdivisions=2, radius=origin_sz)
T_orient = trimesh.transformations.translation_matrix(center + R_obb[:, 1] * (ext[1] / 2.0))
orient.apply_transform(T_orient)
orient.visual.vertex_colors = np.array([green] * len(orient.vertices))
scene.add_geometry(orient)
# 7) 写 JSON
transform_matrix = trimesh.transformations.euler_matrix(0, 0, 0).tolist()
data = {
"center": center.tolist(),
"extents": ext.tolist(),
"scale": [MODEL_SCALE, MODEL_SCALE, MODEL_SCALE],
"target_pose": target_points_list,
"contact_points_pose": contact_points_list,
"transform_matrix": transform_matrix,
"functional_matrix": [],
"orientation_point": T_orient.tolist(),
"contact_points_group": [[0]],
"contact_points_mask": [True],
"contact_points_discription": contact_desc,
"target_point_discription": ["Object centroid."],
"functional_point_discription": [""],
"orientation_point_discription": ["OBB +Y reference."]
}
with open(save_path, "w") as f:
json.dump(data, f, indent=4, separators=(",", ": "))
scene.show()
if __name__ == "__main__":
create_model_data("pokeball")
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