Breps

Tellusim SDK provides efficient and high-performance implementations for common BREP (Boundary Representation) formats used in CAD, modeling, and simulation workflows.

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The Brep system represents models as geometric primitives with boundary constraints defined by curves.

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Support for additional Brep formats can be added via the BrepStream interface.

Supported Brep Formats

Tellusim Engine SDK natively supports the following BREP formats on all platforms:

• BREP (*.brep) - Native Tellusim format optimized for fast loading and runtime efficiency. Supports all Brep features, including materials, and attachments. Node transformation matrices can be stored with 32-bit or 64-bit floating-point precision.

• STEP (*.stp, *.step) - ISO 10303-21 standard format widely used for 3D CAD data exchange. Tellusim provides optimized STEP import with fast parsing and efficient conversion of complex assemblies, surfaces, and geometries.

• TTF (*.ttf) - TrueType Font format. Interpreted as curves for BREP glyph generation.

Example

#include <format/TellusimBrep.h>

// Load brep
Brep brep;
if(!brep.load("brep.step")) return false;

// brep nodes
TS_LOGF(Message, "nodes %u\n", brep.getNumNodes());
for(const BrepNode &node : brep.getNodes()) {
	TS_LOGT(Message, "{0}: {1} {2} {3} {4}\n", brep.findNode(node),
		node.getName(),
		node.getNumChildren(),
		node.getNumGeometries(),
		brep.findNode(node.getParent()));
}

// brep geometries
TS_LOGF(Message, "geometries %u\n", brep.getNumGeometries());
for(const BrepGeometry &geometry : brep.getGeometries()) {
	TS_LOGT(Message, "{0}: <{1}>\n", geometry.getIndex(), geometry.getName());
	
	// Faces
	TS_LOGF(Message, " faces: %u\n", geometry.getNumFaces());
	for(uint32_t i = 0; i < geometry.getNumFaces(); i++) {
		const BrepFace &face = geometry.getFace(i);
		TS_LOGT(Message, "  {0}: {1} <{2}> {3}\n", i,
			face.getTypeName(),
			face.getName(),
			face.getNumCurves());
	}
	
	// Materials
	TS_LOGF(Message, " materials: %u\n", geometry.getNumMaterials());
	for(uint32_t i = 0; i < geometry.getNumMaterials(); i++) {
		const BrepMaterial &material = geometry.getMaterial(i);
		TS_LOGT(Message, "  {0}: <{1}>\n", i,
			material.getName());
	}
}