glb_utils.cpp File Reference

#include "glb_utils.h"
#include <cstdint>
#include <cstring>
#include <fstream>
#include <map>
#include <vector>
#include <json_common.h>
#include <kiplatform/io.h>

Go to the source code of this file.

Functions
bool	FixGlbLinesPrimitives (const wxString &aFilePath)
	Fix LINES primitives in a GLB file that have odd index counts.

Variables
static constexpr uint32_t	GLB_MAGIC = 0x46546C67
static constexpr uint32_t	GLB_CHUNK_JSON = 0x4E4F534A
static constexpr int	GLTF_LINES_MODE = 1

Function Documentation

FixGlbLinesPrimitives()

bool FixGlbLinesPrimitives

(

const wxString &

aFilePath

)

Fix LINES primitives in a GLB file that have odd index counts.

OCCT 7.9+ can emit glTF LINES primitives with odd index counts for degenerate BSpline edges. The glTF spec requires LINES (mode 1) to have an even number of indices since each pair defines one line segment. Blender and other strict importers reject files that violate this constraint.

This function reads the GLB, adjusts any offending accessor counts to be even, and rewrites the file in place.

Parameters

aFilePath

path to the GLB file to fix

Returns

true if the file was processed successfully (or needed no changes)

Definition at line 42 of file glb_utils.cpp.

References KIPLATFORM::IO::AtomicWriteFile(), GLB_CHUNK_JSON, GLB_MAGIC, and GLTF_LINES_MODE.

Referenced by BOOST_AUTO_TEST_CASE(), BOOST_AUTO_TEST_CASE(), BOOST_AUTO_TEST_CASE(), BOOST_AUTO_TEST_CASE(), BOOST_AUTO_TEST_CASE(), BOOST_AUTO_TEST_CASE(), and STEP_PCB_MODEL::WriteGLTF().

Variable Documentation

GLB_CHUNK_JSON

uint32_t GLB_CHUNK_JSON = 0x4E4F534A

staticconstexpr

Definition at line 38 of file glb_utils.cpp.

Referenced by FixGlbLinesPrimitives(), ValidateGlbFile(), and WriteTempGlb().

GLB_MAGIC

uint32_t GLB_MAGIC = 0x46546C67

staticconstexpr

Definition at line 37 of file glb_utils.cpp.

Referenced by FixGlbLinesPrimitives(), ValidateGlbFile(), and WriteTempGlb().

GLTF_LINES_MODE

int GLTF_LINES_MODE = 1

staticconstexpr

Definition at line 39 of file glb_utils.cpp.

Referenced by BOOST_AUTO_TEST_CASE(), BOOST_AUTO_TEST_CASE(), BOOST_AUTO_TEST_CASE(), BOOST_AUTO_TEST_CASE(), FixGlbLinesPrimitives(), and ValidateGlbFile().