Here is a version with open/closed contour
Looks like it needs .openEnded
parameter, like in THREE.CylinderGeometry()
.
https://jsfiddle.net/prisoner849/bygy1xkt/
function ProfiledContourGeometry(profileShape, contour, contourClosed) {
contourClosed = contourClosed !== undefined ? contourClosed : true;
let profileGeometry = new THREE.ShapeBufferGeometry(profileShape);
profileGeometry.rotateX(Math.PI * .5);
let profile = profileGeometry.attributes.position;
let profilePoints = new Float32Array(profile.count * contour.length * 3);
for (let i = 0; i < contour.length; i++) {
let v1 = new THREE.Vector2().subVectors(contour[i - 1 < 0 ? contour.length - 1 : i - 1], contour[i]);
let v2 = new THREE.Vector2().subVectors(contour[i + 1 == contour.length ? 0 : i + 1], contour[i]);
let angle = v2.angle() - v1.angle();
let halfAngle = angle * .5;
let hA = halfAngle;
let tA = v2.angle() + Math.PI * .5;
if (!contourClosed){
if (i == 0 || i == contour.length - 1) {hA = Math.PI * .5;}
if (i == contour.length - 1) {tA = v1.angle() - Math.PI * .5;}
}
let shift = Math.tan(hA - Math.PI * .5);
let shiftMatrix = new THREE.Matrix4().set(
1, 0, 0, 0, -shift, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
);
let tempAngle = tA;
let rotationMatrix = new THREE.Matrix4().set(
Math.cos(tempAngle), -Math.sin(tempAngle), 0, 0,
Math.sin(tempAngle), Math.cos(tempAngle), 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
);
let translationMatrix = new THREE.Matrix4().set(
1, 0, 0, contour[i].x,
0, 1, 0, contour[i].y,
0, 0, 1, 0,
0, 0, 0, 1,
);
let cloneProfile = profile.clone();
shiftMatrix.applyToBufferAttribute(cloneProfile);
rotationMatrix.applyToBufferAttribute(cloneProfile);
translationMatrix.applyToBufferAttribute(cloneProfile);
profilePoints.set(cloneProfile.array, cloneProfile.count * i * 3);
}
let fullProfileGeometry = new THREE.BufferGeometry();
fullProfileGeometry.addAttribute("position", new THREE.BufferAttribute(profilePoints, 3));
let index = [];
let lastCorner = contourClosed == false ? contour.length - 1: contour.length;
for (let i = 0; i < lastCorner; i++) {
for (let j = 0; j < profile.count; j++) {
let currCorner = i;
let nextCorner = i + 1 == contour.length ? 0 : i + 1;
let currPoint = j;
let nextPoint = j + 1 == profile.count ? 0 : j + 1;
let a = nextPoint + profile.count * currCorner;
let b = currPoint + profile.count * currCorner;
let c = currPoint + profile.count * nextCorner;
let d = nextPoint + profile.count * nextCorner;
index.push(a, b, d);
index.push(b, c, d);
}
}
fullProfileGeometry.setIndex(index);
fullProfileGeometry.computeVertexNormals();
return fullProfileGeometry;
}