Interpolate Fill option in Rasterize

[nishitachhipa]

I am working on the area of 5 km² and the point cloud is collected by using an arial UAV system through photogrammetry. I have used CSF plugin to filter the on ground and off ground points.
As per pervious query in http://www.cloudcompare.net/forum/viewtopic.php?t=3384 you have mentioned to use the "Fill with" value specified option below the. As there are lot of empty cells in my study area and with variable heights, I cannot specify one particular value foe all holes. how should i proceed?

[daniel]

Then you are bound to use the 'interpolate' strategy. But this will only work inside the convex hull of the points...