UnityEngine.PostProcessing.MotionBlurComponent.FrameBlendingFilter.BlendFrames(UnityEngine.Rendering.CommandBuffer, float, UnityEngine.Rendering.RenderTargetIdentifier, UnityEngine.Rendering.RenderTargetIdentifier, UnityEngine.Material)

public override void PopulateCommandBuffer(CommandBuffer cb)
        {
#if UNITY_EDITOR
            // Don't render motion blur preview when the editor is not playing as it can in some
            // cases results in ugly artifacts (i.e. when resizing the game view).
            if (!Application.isPlaying)
                return;
#endif

            // Skip rendering in the first frame as motion vectors won't be abvailable until the
            // next one
            if (m_FirstFrame)
            {
                m_FirstFrame = false;
                return;
            }

            var material = context.materialFactory.Get("Hidden/Post FX/Motion Blur");
            var blitMaterial = context.materialFactory.Get("Hidden/Post FX/Blit");
            var settings = model.settings;

            var fbFormat = context.isHdr
                ? RenderTextureFormat.DefaultHDR
                : RenderTextureFormat.Default;

            int tempRT = Uniforms._TempRT;
            cb.GetTemporaryRT(tempRT, context.width, context.height, 0, FilterMode.Point, fbFormat);

            if (settings.shutterAngle > 0f && settings.frameBlending > 0f)
            {
                // Motion blur + frame blending
                reconstructionFilter.ProcessImage(context, cb, ref settings, BuiltinRenderTextureType.CameraTarget, tempRT, material);
                frameBlendingFilter.BlendFrames(cb, settings.frameBlending, tempRT, BuiltinRenderTextureType.CameraTarget, material);
                frameBlendingFilter.PushFrame(cb, tempRT, context.width, context.height, material);
            }
            else if (settings.shutterAngle > 0f)
            {
                // No frame blending
                cb.SetGlobalTexture(Uniforms._MainTex, BuiltinRenderTextureType.CameraTarget);
                cb.Blit(BuiltinRenderTextureType.CameraTarget, tempRT, blitMaterial, 0);
                reconstructionFilter.ProcessImage(context, cb, ref settings, tempRT, BuiltinRenderTextureType.CameraTarget, material);
            }
            else if (settings.frameBlending > 0f)
            {
                // Frame blending only
                cb.SetGlobalTexture(Uniforms._MainTex, BuiltinRenderTextureType.CameraTarget);
                cb.Blit(BuiltinRenderTextureType.CameraTarget, tempRT, blitMaterial, 0);
                frameBlendingFilter.BlendFrames(cb, settings.frameBlending, tempRT, BuiltinRenderTextureType.CameraTarget, material);
                frameBlendingFilter.PushFrame(cb, tempRT, context.width, context.height, material);
            }

            // Cleaning up
            cb.ReleaseTemporaryRT(tempRT);
        }