in src/gltf/properties/PrimitiveData.hpp [39:62]
void AddDracoAttrib(const AttributeDefinition<T> attribute, const std::vector<T>& attribArr) {
draco::PointAttribute att;
int8_t componentCount = attribute.glType.count;
att.Init(
attribute.dracoAttribute,
nullptr,
componentCount,
attribute.dracoComponentType,
false,
componentCount * draco::DataTypeLength(attribute.dracoComponentType),
0);
const int dracoAttId = dracoMesh->AddAttribute(att, true, to_uint32(attribArr.size()));
draco::PointAttribute* attPtr = dracoMesh->attribute(dracoAttId);
std::vector<uint8_t> buf(sizeof(T));
for (uint32_t ii = 0; ii < attribArr.size(); ii++) {
uint8_t* ptr = &buf[0];
attribute.glType.write(ptr, attribArr[ii]);
attPtr->SetAttributeValue(attPtr->mapped_index(draco::PointIndex(ii)), ptr);
}
dracoAttributes[attribute.gltfName] = dracoAttId;
}