LandXML TIN Importer：Blender 导入导出插件

LandXML TIN Importer creates Blender terrain meshes from the authoritative points and faces contained in LandXML surface exports.

The extension preserves the source TIN triangulation instead of generating a new surface. It maps civil Northing, Easting, and Elevation coordinates to Blender axes and supports meters, international feet, and US survey feet.

Large horizontal coordinates can be shifted near the Blender origin to reduce floating-point precision problems. The original geospatial origin, source units, conversion factor, vertex count, face count, and other import details are retained as Blender object custom properties.

When a LandXML file contains multiple surfaces, the extension uses one shared local origin so the surfaces remain aligned. Each import is placed in a dedicated Blender collection.

Key features:

Imports authoritative LandXML points and faces

Preserves the original TIN triangulation

Supports meters, international feet, and US survey feet

Supports Northing/Easting and Easting/Northing point ordering

Shifts large civil coordinates near the Blender origin

Retains the original geospatial origin as object metadata

Preserves alignment between multiple surfaces

Corrects triangle orientation and applies angle-based smooth shading

Records skipped faces with invalid point references

Requires no external Python packages or network access

For best results, export the source surface with both Points and Faces included. Importing points without faces is not supported because that would require reconstructing the source triangulation.

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