{"id":12138,"date":"2022-01-16T20:27:16","date_gmt":"2022-01-16T19:27:16","guid":{"rendered":"http:\/\/www.keris-studio.fr\/blog\/?p=12138"},"modified":"2022-01-17T09:04:17","modified_gmt":"2022-01-17T08:04:17","slug":"photogrammetry-from-drone-part2","status":"publish","type":"post","link":"https:\/\/www.keris-studio.fr\/blog\/?p=12138","title":{"rendered":"Photogrammetry from drone Part2"},"content":{"rendered":"

Preparation<\/h1>\n

Exporting the 3D model, drawing the contour lines will be our goal. First we remove the trees and buildings from the original 3D.<\/p>\n

<\/p>\n

Cleaning<\/p>\n

<\/p>\n

Filling holes, removing trees and buildings creates holes. It can be filled with Metashape.<\/p>\n

<\/p>\n

Retexturing, recreates a nice texture over the filled parts.<\/p>\n

<\/p>\n

Exporting<\/p>\n

<\/p>\n

Post-processing in Rhino-Grasshopper<\/h1>\n

We will show how to draw contour-line very easily with Grasshopper.<\/p>\n

<\/p>\n

Import the mesh.<\/p>\n

Then, Mesh to Quad mesh to SubD , Fill holes in SubD and finally QuadMesh<\/p>\n

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In Grasshopper<\/p>\n

Input Mesh<\/p>\n

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Create a vertical line<\/p>\n

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Divide the line into distances with a Slider, so that it can be changed<\/p>\n

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Create planes from the divided line<\/p>\n

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Intersect with the Mesh<\/p>\n

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You get your contour lines<\/p>\n

Add heights<\/p>\n

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By changing the number of planes, you get more presision<\/p>\n

This is every 20cm<\/p>\n

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Interactive result<\/p>\n

Will add colors depending to Heights. (Click on the image for a readable view<\/em>).<\/p>\n

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It gives this nice result<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n
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Click to enlarge<\/figcaption><\/figure>\n\n\n\n
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\n <\/model-viewer>\n <\/div>\n