[WIP] 1404 Get Raster Pixel Color At Location

[jbeuckm]

Here is a working demo using a brute force method of rendering the raster layer to read one pixel. I'm trying to get someone familiar with the render sequence to help fix this since there are a list of people that need the function. Even a hint would be great!

Roadmap:

• render offscreen and do not interfere with the visible rendered layers
• render or otherwise read only the query area (not the entire viewport)
• get a distribution of raster color values within a given rect
• get a distribution of raster color values within a given polygon

This function seems like part of what happens to find elevation values. Maybe there is a way to generalize the terrain feature to implement this? One difference is that, for my application, the value can not be interpolated. It must return an exact pixel color from the raster image.

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:white_check_mark: jbeuckm
:x: Joe Beuckman

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