Understanding the vertex information units

[zohaibjaved2]

Hello,

I am trying to load a 1 cm cube model exported from Maya. I was able to successfully load it in unreal through following code:

`FString libPath = FPaths::ConvertRelativePathToFull(FPaths::Combine(*FPaths::ProjectDir(), TEXT("Source/ThirdParty/bin/Windows")));
FPlatformProcess::PushDllDirectory(*libPath);

UE_LOG(LogMesh, Log, TEXT("Assimp version : %d,%d,%d"), aiGetVersionMajor(),aiGetVersionMinor(),aiGetVersionRevision());

Assimp::Importer importer;
importer.SetPropertyInteger(AI_CONFIG_PP_SLM_VERTEX_LIMIT, TNumericLimits<int>::Max());
importer.SetPropertyInteger(AI_CONFIG_PP_SLM_TRIANGLE_LIMIT, TNumericLimits<int>::Max());
importer.SetPropertyBool(AI_CONFIG_PP_FD_REMOVE, true);
importer.SetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_ANIMATIONS, false);
importer.SetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_CAMERAS, false);
importer.SetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_TEXTURES, false);
importer.SetPropertyInteger(AI_CONFIG_PP_SBP_REMOVE, aiPrimitiveType_LINE | aiPrimitiveType_POINT);
importer.SetPropertyBool(AI_CONFIG_PP_PTV_KEEP_HIERARCHY, true);

int postProcessSteps = aiProcess_CalcTangentSpace |
						aiProcess_JoinIdenticalVertices |
						aiProcess_Triangulate |
						aiProcess_GenUVCoords |
						aiProcess_SortByPType |
						aiProcess_FindDegenerates |
						aiProcess_FindInvalidData |
						aiProcess_FindInstances |
						aiProcess_OptimizeMeshes |
						aiProcess_FlipWindingOrder |
						aiProcess_GlobalScale |
						aiProcess_MakeLeftHanded | 
						aiProcess_PreTransformVertices;

std::string fileName_str(TCHAR_TO_UTF8(*_filename));

_assimpScene = importer.ReadFile(fileName_str, postProcessSteps);` 

When I try to see the vertex information I get very small value like 0.00499999989. It seems like by default we get units in meters. Is this correct assumption?

Also I want to do the calculations in centimeters. Is there a way to convert it using some importer settings?

[kimkulling]

At this moment Assimp does not support any global unit-setting. Some importers will provide this information in their metadata.
I will open a new PR with this feature. We got this question quite often. So we need a solution for that.