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Invalid tangent fix example

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Passive 2025-07-31 23:07:22 +10:00 • committed by Ottermandias
parent 898963fea5
commit f5f4fe7259
1 changed files with 40 additions and 5 deletions
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43
Penumbra/Import/Models/Export/MeshExporter.cs
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@ -341,6 +341,39 @@ public class MeshExporter
return typeof(VertexPositionNormalTangent);
}
private const float UnitLengthThresholdVec3 = 0.00674f;
internal static bool _IsFinite(float value)
{
return float.IsFinite(value);
}
internal static bool _IsFinite(Vector2 v)
{
return _IsFinite(v.X) && _IsFinite(v.Y);
}
internal static bool _IsFinite(Vector3 v)
{
return _IsFinite(v.X) && _IsFinite(v.Y) && _IsFinite(v.Z);
}
internal static Boolean IsNormalized(Vector3 normal)
{
if (!_IsFinite(normal)) return false;
return Math.Abs(normal.Length() - 1) <= UnitLengthThresholdVec3;
}
internal static Vector3 SanitizeNormal(Vector3 normal)
{
if (normal == Vector3.Zero) return Vector3.UnitX;
return IsNormalized(normal) ? normal : Vector3.Normalize(normal);
}
internal static Vector4 SanitizeTangent(Vector4 tangent)
{
var n = SanitizeNormal(new Vector3(tangent.X, tangent.Y, tangent.Z));
var s = float.IsNaN(tangent.W) ? 1 : tangent.W;
return new Vector4(n, s > 0 ? 1 : -1);
}
/// <summary> Build a geometry vertex from a vertex's attributes. </summary>
private IVertexGeometry BuildVertexGeometry(IReadOnlyDictionary<MdlFile.VertexUsage, List<object>> attributes)
{
@ -352,19 +385,21 @@ public class MeshExporter
if (_geometryType == typeof(VertexPositionNormal))
return new VertexPositionNormal(
ToVector3(GetFirstSafe(attributes, MdlFile.VertexUsage.Position)),
ToVector3(GetFirstSafe(attributes, MdlFile.VertexUsage.Normal))
SanitizeNormal(ToVector3(GetFirstSafe(attributes, MdlFile.VertexUsage.Normal)))
);
if (_geometryType == typeof(VertexPositionNormalTangent))
{
// (Bi)tangents are universally stored as ByteFloat4, which uses 0..1 to represent the full -1..1 range.
// TODO: While this assumption is safe, it would be sensible to actually check.
var bitangent = ToVector4(GetFirstSafe(attributes, MdlFile.VertexUsage.Tangent1)) * 2 - Vector4.One;
// var bitangent = ToVector4(GetFirstSafe(attributes, MdlFile.VertexUsage.Tangent1)) * 2 - Vector4.One;
var vec4 = ToVector4(GetFirstSafe(attributes, MdlFile.VertexUsage.Tangent1));
var bitangent = vec4 with { W = vec4.W == 1 ? 1 : -1 };
return new VertexPositionNormalTangent(
ToVector3(GetFirstSafe(attributes, MdlFile.VertexUsage.Position)),
ToVector3(GetFirstSafe(attributes, MdlFile.VertexUsage.Normal)),
bitangent
SanitizeNormal(ToVector3(GetFirstSafe(attributes, MdlFile.VertexUsage.Normal))),
SanitizeTangent(bitangent)
);
}