How to generate 2D grid map inside of a patch area

Question

David Hermann 2022-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/1690710-how-to-generate-2d-grid-map-inside-of-a-patch-area

回答： George Abrahams 2024-2-10

I would like to create a 2D grid map with equidistante points based on the faces and vertices of an patch.

In my case, I get a complex patch shape from a given figure (fig). With that I can read the vertices and faces

dataObjs = findobj(fig,'-property','XData');
faces = dataObjs.Faces;
vertices = dataObjs.Vertices;

Based on this information, a grid map (e.g. 1m grid) should be placed in the areas of that patch.

And this is where I get stuck.

One idea is that I put a grid map over the whole area and check which points are inside the patch area (like inShape), but I haven't found a suitable solution for this.

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Answer 1

KSSV 2022-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/1690710-how-to-generate-2d-grid-map-inside-of-a-patch-area#answer_936960

Read about inpolygon.

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David Hermann 2022-4-7

Thanks for the quick reply.

With inpolygon I cannot currently reproduce the complex form. I did it once via polyshape based on the vertices coordinate points, the polynomial areas look different then. The patch still uses the faces to connect the vertices.

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Answer 2

George Abrahams 2024-2-10

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Hi @David Hermann.

A 2D grid map of a patch sounds suspiciously like an image of the patch. Considering that you're first extracting the faces and vertices from a figure, most likely you want the either the getframe, saveas, or exportgraphics function.

If for some reason you need more control, you'll need a rasterization algorithm. If it's a 2D triangulation, you could use patch_rasterize on File Exchange. If it's a 3D triangulation, you could use my rendering toolbox on File Exchange.