Unity Engine documentationScript ReferenceUnityEngineParticleSystemVertexStreamsTangentTangent vectors for normal mapping.Read time 1 minuteLast updated 4 days agoDefinition Type: Field Namespace: UnityEngine Assembly: UnityEngine.ParticleSystemModule WarningDeprecated. ParticleSystemVertexStreams is deprecated. Please use ParticleSystemVertexStream instead. Tangent = 4