function destroyTextures(transpClass) {
  transpClass._textureToComposite = undefined;

  transpClass._translucentDepthStencilTexture =
    transpClass._translucentDepthStencilTexture &&
    !transpClass._translucentDepthStencilTexture.isDestroyed() &&
    transpClass._translucentDepthStencilTexture.destroy();
}
Gets whether or not translucent depth was rendered.
@memberof TranslucentTileClassification.prototype

@type {boolean}
@readonly