Obtain a mesh from a texture about geometry3sharp HOT 4 OPEN

Yes this is what I was going to recommend. Create a DenseGrid3f that has the same X/Y resolution as your image, and is, say, 10 voxels high in Z. Initialize to 1. Then for Z-layers between, say, 2 and 8, set the voxel to -1 if the pixel (x,y) is white. Pass this into DenseGridTrilinearImplicit constructor, which you can then pass into Marching Cubes to get a mesh. More details in these tutorials:

http://www.gradientspace.com/tutorials/2017/11/21/signed-distance-fields-tutorial
http://www.gradientspace.com/tutorials/2018/2/20/implicit-surface-modeling

This will smooth things out a little. Alternately for a blocky mesh you can use Bitmap3 and VoxelSurfaceGenerator:
http://www.gradientspace.com/tutorials/2017/12/14/3d-bitmaps-and-minecraft-meshes

reduce triangle count afterwards with Reducer:
http://www.gradientspace.com/tutorials/2017/8/30/mesh-simplification

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This is EXACTLY what i was looking for. Thank you very much for your help .(both of you) :)

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You should generate signed distance field firstly then you can use marching cubes to generate mesh.

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Simply I am going to make image-to-mesh online tool. A little bit later.

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