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I started to study TIN in QGIS and created my first TIN from a point layer with elevation. There are two interpolation methods called Linear and Clough-Toucher that give very different results. Linear looks like a regular Raster and with Clough-Toucher the result cannot be interpreted at first glance. Further the values of both methods vary a lot, as can be seen in the picture.

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I cannot find information in the QGIS Docs what the difference is between the two methods.

What is the difference and why are the results so different?

I am using QGIS 3.4.13.

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    Really a good question. I can't answer it propperly. Just to comment that extreme values are inside the triangles of the triangulation and the surface satisfaces a continuous slope at each point. The algorithm creates "valleys and mountains" within triangles in order to satisfy that condition. – Gabriel De Luca Jan 31 at 22:06

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