关于unity:六Unity-生成几种常用模型meshFrustumShape圆锥台

1、取得顶点的数据汇合

protected override Vector3[] GetVertices()        {            var bottomPoints = new Vector3[_circularSideCount];            var topPoints = new Vector3[_circularSideCount];            for (var i = 0; i < _circularSideCount; i++)            {                var rad = i * 1.0f / _circularSideCount * Mathf.PI * 2;                var bottomCos = Mathf.Cos(rad) * _bottomRadius;                var bottomSin = Mathf.Sin(rad) * _bottomRadius;                var topCos = Mathf.Cos(rad) * _topRadius;                var topSin = Mathf.Sin(rad) * _topRadius;                bottomPoints[i] = new Vector3(bottomCos, -_height * 0.5f, bottomSin) - _vertexOffset;                topPoints[i] = new Vector3(topCos, _height * 0.5f, topSin) - _vertexOffset;            }            var curIndex = 0;            var arrayLen = (_circularSideCount + 1) * 2 + (_circularSideCount + 1) * 2;            var vertices = new Vector3[arrayLen];            //底面            vertices[curIndex++] = new Vector3(0, -_height * 0.5f, 0) - _vertexOffset;            for (var i = 0; i < _circularSideCount; i++)            {                vertices[curIndex++] = bottomPoints[i];            }            //顶面            vertices[curIndex++] = new Vector3(0, _height * 0.5f, 0) - _vertexOffset;            for (var i = 0; i < _circularSideCount; i++)            {                vertices[curIndex++] = topPoints[i];            }            //侧面            for (var i = 0; i < _circularSideCount; i++)            {                vertices[curIndex++] = bottomPoints[i];                vertices[curIndex++] = topPoints[i];            }            vertices[curIndex++] = bottomPoints[0];            vertices[curIndex] = topPoints[0];            return vertices;        }

2、取得法线方向的数据汇合

protected override Vector3[] GetNormals()        {            var curIndex = 0;            var arrayLen = (_circularSideCount + 1) * 2 + (_circularSideCount + 1) * 2;            var normals = new Vector3[arrayLen];            //底面            for (var i = 0; i <= _circularSideCount; i++)            {                normals[curIndex++] = Vector3.down;            }            //顶面            for (var i = 0; i <= _circularSideCount; i++)            {                normals[curIndex++] = Vector3.up;            }            //侧面            for (var i = 0; i <= _circularSideCount; i++)            {                var rad = i * 1.0f / _circularSideCount * Mathf.PI * 2;                var cos = Mathf.Cos(rad);                var sin = Mathf.Sin(rad);                normals[curIndex++] = new Vector3(cos, 0, sin);                normals[curIndex++] = new Vector3(cos, 0, sin);            }            return normals;        }

3、取得三角面顶点的索引

protected override int[] GetTriangles()        {            var curIndex = 0;            var arrayLen = _circularSideCount * 3 + _circularSideCount * 3 + _circularSideCount * 3 * 2;            var triangles = new int[arrayLen];            //底面            for (var i = 1; i < _circularSideCount; i++)            {                triangles[curIndex++] = 0;                triangles[curIndex++] = i;                triangles[curIndex++] = i + 1;            }            triangles[curIndex++] = 0;            triangles[curIndex++] = _circularSideCount;            triangles[curIndex++] = 1;            //顶面            for (var i = _circularSideCount + 2; i < _circularSideCount * 2 + 1; i++)            {                triangles[curIndex++] = i;                triangles[curIndex++] = _circularSideCount + 1;                triangles[curIndex++] = i + 1;            }            triangles[curIndex++] = _circularSideCount * 2 + 1;            triangles[curIndex++] = _circularSideCount + 1;            triangles[curIndex++] = _circularSideCount + 2;            //侧面            var startIndex = _circularSideCount * 2 + 2;            for (var i = 0; i < _circularSideCount; i++)            {                var index = i * 2;                triangles[curIndex++] = startIndex + index;                triangles[curIndex++] = startIndex + index + 1;                triangles[curIndex++] = startIndex + index + 3;                triangles[curIndex++] = startIndex + index + 3;                triangles[curIndex++] = startIndex + index + 2;                triangles[curIndex++] = startIndex + index;            }            return triangles;        }

4、取得UV坐标的数据汇合

 protected override Vector2[] GetUVs()        {            var curIndex = 0;            var arrayLen = (_circularSideCount + 1) * 2 + (_circularSideCount + 1) * 2;            var uvs = new Vector2[arrayLen];            //底面            uvs[curIndex++] = new Vector2(0.5f, 0.5f);//圆心            for (var i = 0; i < _circularSideCount; i++)            {                var rad = i * 1.0f / _circularSideCount * Mathf.PI * 2;                var cos = Mathf.Cos(rad);                var sin = Mathf.Sin(rad);                uvs[curIndex++] = new Vector2(cos, sin) * 0.5f + new Vector2(0.5f, 0.5f);            }            //顶面            uvs[curIndex++] = new Vector2(0.5f, 0.5f);            for (var i = 0; i < _circularSideCount; i++)            {                var rad = i * 1.0f / _circularSideCount * Mathf.PI * 2;                var cos = Mathf.Cos(rad);                var sin = Mathf.Sin(rad);                uvs[curIndex++] = new Vector2(cos, sin) * 0.5f + new Vector2(0.5f, 0.5f);            }            //侧面            var value = 1.0f / _circularSideCount;            for (var i = 0; i <= _circularSideCount; i++)            {                uvs[curIndex++] = new Vector2(value * i, 0);                uvs[curIndex++] = new Vector2(value * i, 1);            }            return uvs;        }

成果如下：
gitee地址:https://gitee.com/pangdudu010...