Unity3D RenderTextureから, RenderTargetIdentifierを作成

renderTexture = new RenderTexture(
    width,
    height,
    24,
    RenderTextureFormat.Default,
    RenderTextureReadWrite.Default);

CommandBuffer commandBuffer = new CommandBuffer();

int screenCopyID1 = Shader.PropertyToID("_Temp1");
commandBuffer.GetTemporaryRT(
    screenCopyID1,
    width, height, 0,
    FilterMode.Bilinear);

RenderTargetIdentifier renderTargetId = new RenderTargetIdentifier(renderTexture);
commandBuffer.Blit(renderTargetId, screenCopyID1);

てな感じで, コマンドバッファに組み込んでいける.