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SetConstantBuffer resets to default when reimporting the script in the Project window if IF statement is false

Graphics - LowLevel


Reproduction steps:
1. Open the attached project ""
2. Open "BugDemo.unity" Scene
3. In the Hierarchy window select the sphere GameObject
4. In the Inspector window check the "Set Colour" box in the Demo script Component
5. In the Project window right-click on "DummyScript.cs" script and select Reimport
6. Observe the sphere in the Scene view

Expected result: After Reimporting the script, the sphere color stays the same
Actual result: After Reimporting the script the sphere color becomes black

Reproducible with: 2019.4.30f1, 2020.3.18f1, 2021.1.22f1, 2021.2.0b12, 2022.1.0a10

  1. Resolution Note:

    The behavior seems to be correct. Changes to assets/scripts are not persisted after an update.

    So either the setcolor needs to be reapplied on Enable:

    using System.Collections;
    using System.Collections.Generic;
    using UnityEngine;

    public class Demo : MonoBehaviour
        private ComputeBuffer m_computeBuffer;
        public Material m_mat;

        void OnEnable()
            m_computeBuffer = new ComputeBuffer(1, 16, ComputeBufferType.Constant);
            m_computeBuffer.SetData(new Vector4[]{new Vector4(1, 0, 0, 1)});
            // NEW: Copy state to temp field
            _SetColourTemp = SetColour;

        public bool SetColour;

        // NEW: Use temp field
        private bool _SetColourTemp;

        // Update is called once per frame
        void Update()
            Debug.Log($"SetColour {SetColour}");
            // NEW: Use temp field
                _SetColourTemp = false;
                m_mat.SetConstantBuffer("buffer", m_computeBuffer, 0, 16);

    Or a new material needs to be saved (and DB needs to be informed about the changes), like:

    var mat = AssetDatabase.LoadAssetAtPath<Material>( "Assets/Material.mat" );
    Undo.RecordObject( mat, "Set Color" );
     mat.SetColor( "_Color", );
    EditorUtility.SetDirty( mat );

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