Function TEST

source/MRTest/MRMeshMeshDistanceLimitTests.cpp:74–117

clang-format off ---------------------------------------------------------------------------- (a) FarApart - gap of 7.5 mm, much larger than the 1 mm limit. Cross-section at z = 1.5 (y-axis vertical, x-axis horizontal): y ^ +---+ 2| +-------+ | b | b: 1x1x1 cube | | |

//  parallel coplanar cube faces unless a vertex match is present.
// clang-format on
TEST( MRMesh, MeshMeshDistance_FarApart )
{
    const auto a = makeRefCube();  // [-2, 2]^3
    const auto b = makeUnitCube(); // [-0.5, 0.5]^3
    const AffineXf3f xf = AffineXf3f::translation( Vector3f( 10.0f, 1.5f, 1.5f ) );
    const float trueDist = 7.5f;
    const float trueDistSq = trueDist * trueDist;

    // no limit: function returns the true gap
    {
        const auto d = findDistance( a, b, &xf, kNoLimitSq );
        EXPECT_NEAR( d.distSq, trueDistSq, 1e-2f );

        const auto sd = findSignedDistance( a, b, &xf, kNoLimitSq );
        EXPECT_NEAR( sd.signedDist, trueDist, 1e-2f );
        EXPECT_EQ( sd.status, MeshMeshCollisionStatus::BothOutside );
    }

    // 1 mm limit: real distance exceeds the limit -> findDistance early-exits
    // returning distSq = upDistLimitSq with invalid res.a/b. findSignedDistance
    // cannot determine inside/outside without valid projection points, so it
    // reports NotColliding with signedDist = +sqrt(upDistLimitSq) = 1.0.
    {
        const auto d = findDistance( a, b, &xf, kOneMmLimitSq );
        EXPECT_FLOAT_EQ( d.distSq, kOneMmLimitSq );

        const auto sd = findSignedDistance( a, b, &xf, kOneMmLimitSq );
        EXPECT_FLOAT_EQ( sd.signedDist, 1.0f );
        EXPECT_EQ( sd.status, MeshMeshCollisionStatus::NotColliding );
    }

    // strict 0 limit: findDistance never descends into the BVH, returns
    // distSq = 0 with invalid res.a/b. findCollidingTriangles is empty for
    // far-apart meshes, but inside/outside cannot be derived from the invalid
    // points, so the function reports NotColliding with signedDist = 0.
    {
        const auto d = findDistance( a, b, &xf, kZeroLimitSq );
        EXPECT_FLOAT_EQ( d.distSq, kZeroLimitSq );

        const auto sd = findSignedDistance( a, b, &xf, kZeroLimitSq );
        EXPECT_FLOAT_EQ( sd.signedDist, 0.0f );
        EXPECT_EQ( sd.status, MeshMeshCollisionStatus::NotColliding );
    }
}

// clang-format off
// ----------------------------------------------------------------------------