normal-position-combination

Python Binding for Efficiently Combining Positions and Normals for Precise 3D Geometry

Before	After	Before	After

Efficiently Combining Positions and Normals for Precise 3D Geometry

Nehab, D.; Rusinkiewicz, S.; Davis, J.; Ramamoorthi, R.
ACM Transactions on Graphics - SIGGRAPH 2005
Los Angeles, California, July 2005, Volume 24, Issue 3, pp. 536-543

Original C++ implementation: normal-position-combination

Install

pip install normal-position-combination

Usage

First you need to have a mesh with (relatively) accurate vertex normals. The method will optimize the vertex positions to better fit the normals.

Process a trimesh.Trimesh Object

import trimesh
import normal_position_combination as npc
mesh = trimesh.load_mesh('./sample_data/panel.ply')
optimized_mesh = npc.process_trimesh(mesh)

Process on numpy Arrays

Input mesh vertices, faces, and normals as numpy arrays, and get the optimized vertices.

import numpy as np
import normal_position_combination as npc
mesh = trimesh.load_mesh('./sample_data/panel.ply')
optimized_vertices = npc.process_ndarray(
    np.array(mesh.vertices, dtype=np.float32),
    np.array(mesh.faces, dtype=np.int64),
    np.array(mesh.vertex_normals, dtype=np.float32),
)

Directly Process a Mesh File

import normal_position_combination as npc
npc.process_mesh_file(
    input_filename='./sample_data/panel.ply',
    output_filename='./sample_data/processed-panel.ply'
)

Parameters

Please refer to the original implementation's manual for the detailed explanation of the parameters.

Build from Source

Ubuntu / Debian

# build trimesh2
sudo apt install libglu1-mesa libglu1-mesa-dev libxi-dev
cd submodules/trimesh2
make -j

# build normal-position-combination
cd ../..
sudo apt install libsuitesparse-dev
pip install .

RHEL Series

sudo yum install mesa-libGLU mesa-libGLU-devel libXi-devel suitesparse-devel openblas-devel libomp-devel
cd submodules/trimesh2
make -j

cd ../..
sudo yum install suitesparse-devel
pip install .