| 31 | } |
| 32 | |
| 33 | Expected<Mesh> offsetMesh( const MeshPart & mp, float offset, const OffsetParameters& params /*= {} */ ) |
| 34 | { |
| 35 | MR_TIMER; |
| 36 | assert( params.signDetectionMode == SignDetectionMode::Unsigned |
| 37 | || params.signDetectionMode == SignDetectionMode::OpenVDB |
| 38 | || params.signDetectionMode == SignDetectionMode::HoleWindingRule ); |
| 39 | |
| 40 | if ( params.voxelSize <= 0 ) |
| 41 | { |
| 42 | assert( false ); |
| 43 | return unexpected( "invalid voxelSize value" ); |
| 44 | } |
| 45 | |
| 46 | float voxelSize = params.voxelSize; |
| 47 | bool useShell = params.signDetectionMode == SignDetectionMode::Unsigned; |
| 48 | bool signPostprocess = params.signDetectionMode == SignDetectionMode::HoleWindingRule; |
| 49 | |
| 50 | if ( useShell ) |
| 51 | offset = std::abs( offset ); |
| 52 | |
| 53 | auto offsetInVoxels = offset / voxelSize; |
| 54 | |
| 55 | auto voxelSizeVector = Vector3f::diagonal( voxelSize ); |
| 56 | // Make grid |
| 57 | FloatGrid grid; |
| 58 | if ( !useShell && !signPostprocess ) |
| 59 | { |
| 60 | // Compute signed distance grid |
| 61 | grid = meshToLevelSet( mp, AffineXf3f(), voxelSizeVector, std::abs( offsetInVoxels ) + 2, |
| 62 | subprogress( params.callBack, 0.0f, 0.5f ) ); |
| 63 | } |
| 64 | else |
| 65 | { |
| 66 | // Compute unsigned distance grid |
| 67 | grid = meshToDistanceField( mp, AffineXf3f(), voxelSizeVector, std::abs( offsetInVoxels ) + 2, |
| 68 | subprogress( params.callBack, 0.0f, signPostprocess ? 0.33f : 0.5f ) ); |
| 69 | setLevelSetType( grid ); // to flip mesh normals |
| 70 | } |
| 71 | |
| 72 | if ( !grid ) |
| 73 | return unexpectedOperationCanceled(); |
| 74 | |
| 75 | if ( signPostprocess ) |
| 76 | { |
| 77 | auto signRes = makeSignedByWindingNumber( grid, Vector3f::diagonal( voxelSize ), mp.mesh, |
| 78 | { |
| 79 | .fwn = params.fwn, |
| 80 | .windingNumberThreshold = params.windingNumberThreshold, |
| 81 | .windingNumberBeta = params.windingNumberBeta, |
| 82 | .progress = subprogress( params.callBack, 0.33f, 0.66f ) |
| 83 | } ); |
| 84 | if ( !signRes.has_value() ) |
| 85 | return unexpected( std::move( signRes.error() ) ); |
| 86 | } |
| 87 | |
| 88 | // Make offset mesh |
| 89 | auto newMesh = gridToMesh( std::move( grid ), GridToMeshSettings{ |
| 90 | .voxelSize = voxelSizeVector, |