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// Copyright 2018 The Immersive Web Community Group
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
import {GeometryBuilderBase} from './primitive-stream.js';
export class ConeBuilder extends GeometryBuilderBase {
pushCone(size = 0.5) {
let stream = this.primitiveStream;
let coneSegments = 64;
stream.startGeometry();
// Cone side vertices
for (let i = 0; i < coneSegments; ++i) {
let idx = stream.nextVertexIndex;
stream.pushTriangle(idx, idx + 1, idx + 2);
let rad = ((Math.PI * 2) / coneSegments) * i;
let rad2 = ((Math.PI * 2) / coneSegments) * (i + 1);
stream.pushVertex(
Math.sin(rad) * (size / 2), -size, Math.cos(rad) * (size / 2),
i / coneSegments, 0.0,
Math.sin(rad), 0.25, Math.cos(rad));
stream.pushVertex(
Math.sin(rad2) * (size / 2), -size, Math.cos(rad2) * (size / 2),
i / coneSegments, 0.0,
Math.sin(rad2), 0.25, Math.cos(rad2));
stream.pushVertex(
0, size, 0,
i / coneSegments, 1.0,
Math.sin((rad + rad2) / 2), 0.25, Math.cos((rad + rad2) / 2));
}
// Base triangles
let baseCenterIndex = stream.nextVertexIndex;
stream.pushVertex(
0, -size, 0,
0.5, 0.5,
0, -1, 0);
for (let i = 0; i < coneSegments; ++i) {
let idx = stream.nextVertexIndex;
stream.pushTriangle(baseCenterIndex, idx, idx + 1);
let rad = ((Math.PI * 2) / coneSegments) * i;
let rad2 = ((Math.PI * 2) / coneSegments) * (i + 1);
stream.pushVertex(
Math.sin(rad2) * (size / 2.0), -size, Math.cos(rad2) * (size / 2.0),
(Math.sin(rad2) + 1.0) * 0.5, (Math.cos(rad2) + 1.0) * 0.5,
0, -1, 0);
stream.pushVertex(
Math.sin(rad) * (size / 2.0), -size, Math.cos(rad) * (size / 2.0),
(Math.sin(rad) + 1.0) * 0.5, (Math.cos(rad) + 1.0) * 0.5,
0, -1, 0);
}
stream.endGeometry();
}
}
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