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I have created a VertexPositionColor position and drew it in the XNA like this

VertexPositionColor[] backbone;
backbone = new VertexPositionColor[2];

backbone[0].Position = new Vector3(0, 22, 0);
backbone[0].Color = Color.Black;
backbone[1].Position = new Vector3(0, 10, 0);
backbone[1].Color = Color.Black;

In the draw method

graphics.GraphicsDevice.DrawUserPrimitives<VertexPositionColor>(PrimitiveType.LineList, backbone, 0, 1);

My question is, is it possible to map a 3d bone (Model exported as fbx) to these coordinates. or is there a much easier way to achieve this.

enter image description here

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Yes, is possible to visualize model bones. This article help you with it. Result can be seen for example on this my video

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