I am trying to create cylinders with python and saving them in an object file. The cylinder mesh generation is working fine and placing the cylinder at a specific x, y, z coordinate is also working fine, but when trying to rotate the cylinder to the start and end coordinates it doesn't rotate right. My code: import trimesh import numpy as np from scipy.spatial.transform import Rotation as R def generate_cylinders_mesh(strat_points, end_points, radii, filename): cylinders = [] for start_point, end_point, radius in zip(strat_points, end_points, radii): start_x, start_y, start_z = start_point end_x, end_y, end_z = end_point delta_x = end_x - start_x delta_y = end_y - start_y delta_z = end_z - start_z height = np.sqrt((delta_x)**2 + (delta_y)**2 + (delta_z)**2) centre_x = (start_x + end_x) / 2 centre_y = (start_y + end_y) / 2 centre_z = (start_z + end_z) / 2 centre = (centre_x, centre_y, centre_z) cylinder = trimesh.creation.cylinder(subdivisions=3, radius=radius, height=height) cylinder.apply_translation(centre) rot_x = np.degrees(np.atan2(delta_y, delta_z)) rot_y = np.degrees(np.atan2(delta_x, delta_z)) rot_z = np.degrees(np.atan2(delta_y, delta_x)) directions = (rot_x, rot_y, rot_z) # Convert to Rotation Matrix r = R.from_euler('xyz', directions, degrees=True) rotation_matrix = np.eye(4) # Identity matrix (4x4) for homogeneous transformation rotation_matrix[:3, :3] = r.as_matrix() # Assign 3x3 rotation # Apply transformation cylinder.apply_transform(rotation_matrix) cylinders.append(cylinder) # Combine all spheres into a single mesh combined_mesh_cylinders = trimesh.util.concatenate(cylinders) # Save the mesh to an .obj file combined_mesh_cylinders.export(filename) Continue reading...
