在babylon中绘制坐标轴

作者：七棵菜日期：2022-11-30 栏目：计算机分类：1 人气：1049

我们旋转物体的时候，经常需要设置参照物，否则物体转来转去，我们很容易晕头转向。
以下为在世界坐标系原点绘制坐标轴的方法：

```
// show axis
var showAxis = function(size) {
	var makeTextPlane = function(text, color, size) {
		var dynamicTexture = new BABYLON.DynamicTexture("DynamicTexture", 50, scene, true);
		dynamicTexture.hasAlpha = true;
		dynamicTexture.drawText(text, 5, 40, "bold 36px Arial", color , "transparent", true);
		var plane = new BABYLON.Mesh.CreatePlane("TextPlane", size, scene, true);
		plane.material = new BABYLON.StandardMaterial("TextPlaneMaterial", scene);
		plane.material.backFaceCulling = false;
		plane.material.specularColor = new BABYLON.Color3(0, 0, 0);
		plane.material.diffuseTexture = dynamicTexture;
		return plane;
	};

var axisX = BABYLON.Mesh.CreateLines("axisX", [new BABYLON.Vector3.Zero(), new BABYLON.Vector3(size, 0, 0), new BABYLON.Vector3(size * 0.95, 0.05 * size, 0), new BABYLON.Vector3(size, 0, 0), new BABYLON.Vector3(size * 0.95, -0.05 * size, 0)], scene);
	axisX.color = new BABYLON.Color3(1, 0, 0);
	var xChar = makeTextPlane("X", "red", size / 10);
	xChar.position = new BABYLON.Vector3(0.9 * size, -0.05 * size, 0);

var axisY = BABYLON.Mesh.CreateLines("axisY", [new BABYLON.Vector3.Zero(), new BABYLON.Vector3(0, size, 0), new BABYLON.Vector3( -0.05 * size, size * 0.95, 0), new BABYLON.Vector3(0, size, 0), new BABYLON.Vector3( 0.05 * size, size * 0.95, 0)], scene);
	axisY.color = new BABYLON.Color3(0, 1, 0);
	var yChar = makeTextPlane("Y", "green", size / 10);
	yChar.position = new BABYLON.Vector3(0, 0.9 * size, -0.05 * size);

var axisZ = BABYLON.Mesh.CreateLines("axisZ", [new BABYLON.Vector3.Zero(), new BABYLON.Vector3(0, 0, size), new BABYLON.Vector3( 0 , -0.05 * size, size * 0.95), new BABYLON.Vector3(0, 0, size), new BABYLON.Vector3( 0, 0.05 * size, size * 0.95)], scene);
	axisZ.color = new BABYLON.Color3(0, 0, 1);
	var zChar = makeTextPlane("Z", "blue", size / 10);
	zChar.position = new BABYLON.Vector3(0, 0.05 * size, 0.9 * size);
};
```

标签： babylon 坐标系坐标轴

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