is there any solution? or trick to block the sun like vrays clipper fx ?
Maybe - but may result in a different "look".
I've considered boxing in the complete scene and this using a variety of lights to simulate the desired look. Then take the render into PS and swap out the backdrop to natural color and fake a gradient. Haven't tried this so not sure of the end results. I'm pretty sure you can use the section place tool to get the sliced effect however it will only work in the form of a plane. I am not aware of a tool within SKP that will create a section based on a volume if one exists please share.