MeshEdgesGeometry is a simple class to extract edges from a Three.js object - a mesh or a group with children.
The hierarchy and substructures of the input object are flattened out. Their positions, scales and rotations are baked into world coordinates. MeshEdgesGeometry is like THREE.EdgesGeometry, except that it does not work on THREE.BufferGeometry, but on THREE.Object3D.MeshGouraudMaterial is an addon material in Three.js used to implement per-vertex (Gouraud) shading.
In early versions of Three.js, this per-vertex behavior belonged to MeshLambertMaterial. However, starting from r144, MeshLambertMaterial was upgraded to use per-fragment (Phong) shading to improve visual quality. To preserve the low-cost, retro look of vertex-based lighting for specific use cases, the original functionality was moved into the examples folder as MeshGouraudMaterial.STL, OBJ, VTK and GLTF Viewer.
For educational purposes only.
Uses Three.js to load, display, and manipulate a model read from a file. The center of the model bounding box is translated to the origin so an arcball like controller can rotate the model. The app interface was designed for mobile devices, and the whole (vastly commented) code is only about a thousand lines of Vanilla JS code.
I am not a designer, and none of the models used here were made by me. The sources of the models are in the links below, and I would like to thank their authors.
Four file formats are currently supported:
STL does not support an indexed geometry. That is why it has multiple duplicate vertices on all triangles (explicit representation), and each vertex borrows its normal from the triangle it belongs to. As a consequence, at the same position, there are multiple normal vectors. This leads to a non-smooth surface when using the normal attribute for lighting calculation. Therefore, some magical code is necessary to smooth the model by applying mergeVertices to its BufferGeometry followed by a recalculation of their normals.
MTL file, short for Material Template Library, is companion file format used in 3D computer graphics and modeling. It is often associated with Wavefront OBJ file format, which is common format for storing 3D models and their associated materials and textures.
The main reason for creating yet another data file format is to offer a consistent data representation scheme for a variety of dataset types, and to provide a simple method to communicate data between software.
# Resize textures. gltf-transform resize input.glb output.glb --width 1024 --height 1024
