Andrey Zimin Posted January 31, 2018 Share Posted January 31, 2018 Friends! It's a simple mathematical problem. And it can be solved. That is the question. How is it possible to implement built-in methods of Babylon So. There is an object. In the figure it is denoted P(xp, yp). There is a point where the object should move. M(xm, ym) The question of how to organize the rotation of the object so that its positive X-axis was directed in the direction M when the object moves. I mathematically to calculate the angle? mesh.rotate(BABYLON.Axis.Y, THIS_ANGLE, BABYLON.Space.WORLD) Or is there a method to which you can put the coordinates of the point and he will apply and I will turn my object in the desired direction? WARNING: Rotate only around the axis Y (2D rotate) Quote Link to comment Share on other sites More sharing options...
Amarth2Estel Posted January 31, 2018 Share Posted January 31, 2018 Hi Andrey Zimin. While depending on how you draw your mesh, you may use the method LookAt. Here is a PG (modify line 50 to see behaviour) Andrey Zimin and NasimiAsl 1 1 Quote Link to comment Share on other sites More sharing options...
brianzinn Posted January 31, 2018 Share Posted January 31, 2018 https://en.wikipedia.org/wiki/Dot_product (I think it's the cosine of that). The formula in the Math class: https://github.com/BabylonJS/Babylon.js/blob/master/src/Math/babylon.math.ts#L2121 I think it returns the cosine of the angle between the 2. Only rotating on the Y, then make the second vector have the same Y? If you make a PG I think we can figure it out. Here's my favourite lookAt PG (I think it's from Adam): https://www.babylonjs-playground.com/#UMQ4UR#2 Andrey Zimin 1 Quote Link to comment Share on other sites More sharing options...
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