javascript,three.js,shapes , How to make the arc corners go out not in with a Three.js Shape

## Question:

Tag: javascript,three.js,shapes

How to make all three corners ( created using shape.absarc) of the Three.js Shape go out and not in?

``````    // Shape
var material = new THREE.MeshNormalMaterial();

pt1 = new THREE.Vector3(40, 50, 0);
pt2 = new THREE.Vector3(-40, 0, 0);
pt3 = new THREE.Vector3(30, -20, 0);

p = pt3.clone().sub(pt1);
a1 = Math.atan2(p.y, p.x) + Math.PI / 2;

p = pt2.clone().sub(pt1);
a2 = Math.atan2(p.y, p.x) - Math.PI / 2;

p = pt1.clone().sub(pt2);
a3 = Math.atan2(p.y, p.x) + Math.PI / 2;

p = pt3.clone().sub(pt2);
a4 = Math.atan2(p.y, p.x) - Math.PI / 2;

shape = new THREE.Shape();
shape.absarc(pt1.x, pt1.y, radius, a1, a2, true);

shape.absarc(pt2.x, pt2.y, radius, a3, a4, true);

shape.absarc(pt3.x, pt3.y, radius, a4, a1, true);

var geometry = shape.extrude({
amount: 10,
bevelEnabled: false
});

mesh = new THREE.Mesh(geometry, material);
mesh.position.z = 0;

``````

One corner goes 'out', but two go 'in'. How do you make all the corners bulge out?

Here is one way to create an extruded shape from a path.

``````var path = new THREE.Path();

path.absarc( pt1.x, pt1.y, radius, a1, a2, false );

path.absarc( pt2.x, pt2.y, radius, a3, a4, false );

path.absarc( pt3.x, pt3.y, radius, a4, a1, false );

var geometry = path.createSpacedPointsGeometry( 100 );

var shape = new THREE.Shape( geometry.vertices );

var geometry = shape.extrude( {
amount: 10,
bevelEnabled: false
} );

var mesh = new THREE.Mesh( geometry, new THREE.MeshNormalMaterial() );
``````

http://jsfiddle.net/v7v4fu2v/3/

three.js r.71

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