Converting a height map to a normal map

Sample the points around to get a polygon find the normal to the polygon sample a triangle to get single normal? sample four points and get avg normal? 8 pts?

normal map is derivative of height map

WFH on lockdown, like me? Let’s help each other out! I just released Vidrio, a free app for macOS and Windows to make your screen-sharing awesomely holographic. “Oh damn that's genius”, said some YouTuber when he saw it. But don't believe him, or the #1 on Product Hunt. Instead, believe this demo:

With Vidrio

With generic competitor

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