关于unity:四Unity-生成几种常用模型meshCylinderShape圆柱体

圆柱体的顶点有顶面、底面和侧面三局部。
1、取得顶点的数据汇合

protected override Vector3[] GetVertices()        {            int curIndex = 0;//以后索引            int arrayLen = (_circularSideCount + 1) * 2 + _circularSideCount * 2 + 2;//数组的长度            var vertices = new Vector3[arrayLen];            //底面            vertices[curIndex++] = new Vector3(0, -_height * 0.5f, 0) - _verticeOffset; ;//圆心            for (int i = 0; i < _circularSideCount; i++)            {                var rad = i * 1.0f / _circularSideCount * Mathf.PI * 2;//弧度                var cos = Mathf.Cos(rad) * _radius;                var sin = Mathf.Sin(rad) * _radius;                vertices[curIndex++] = new Vector3(cos, -_height * 0.5f, sin) - _verticeOffset;            }            //顶面            vertices[curIndex++] = new Vector3(0, _height * 0.5f, 0) - _verticeOffset; ;//圆心            for (int i = 0; i < _circularSideCount; i++)            {                var rad = i * 1.0f / _circularSideCount * Mathf.PI * 2;//弧度                var cos = Mathf.Cos(rad) * _radius;                var sin = Mathf.Sin(rad) * _radius;                vertices[curIndex++] = new Vector3(cos, _height * 0.5f, sin) - _verticeOffset;            }            //侧面            int sideStartIndex = curIndex;            for (int i = 0; i < _circularSideCount; i++)            {                var rad = i * 1.0f / _circularSideCount * Mathf.PI * 2;//弧度                var cos = Mathf.Cos(rad) * _radius;                var sin = Mathf.Sin(rad) * _radius;                vertices[curIndex++] = new Vector3(cos, -_height * 0.5f, sin) - _verticeOffset;                vertices[curIndex++] = new Vector3(cos, _height * 0.5f, sin) - _verticeOffset;            }            vertices[curIndex++] = vertices[sideStartIndex];            vertices[curIndex] = vertices[sideStartIndex + 1];            return vertices;        }

2、取得法线方向的数据汇合

protected override Vector3[] GetNormals()        {            int curIndex = 0;            int arrayLen = (_circularSideCount + 1) * 2 + _circularSideCount * 2 + 2;            var normals = new Vector3[arrayLen];            //底面            for (int i = 0; i <= _circularSideCount; i++)            {                normals[curIndex++] = Vector3.down;            }            //顶面            for (int i = 0; i <= _circularSideCount; i++)            {                normals[curIndex++] = Vector3.up;            }            //侧面            for (int i = 0; i <= _circularSideCount; i++)            {                float 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()        {            int curIndex = 0;            int arrayLen = _circularSideCount * 3 + _circularSideCount * 3 + _circularSideCount * 3 * 2;            var triangles = new int[arrayLen];            //底面            for (int 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 (int i = _circularSideCount + 2; i < _circularSideCount * 2 + 1; i++)            {                triangles[curIndex++] = _circularSideCount + 1;                triangles[curIndex++] = i + 1;                triangles[curIndex++] = i;            }            triangles[curIndex++] = _circularSideCount + 1;            triangles[curIndex++] = _circularSideCount + 2;            triangles[curIndex++] = _circularSideCount * 2 + 1;            //侧面            int startIndex = _circularSideCount * 2 + 2;            for (int i = 0; i < _circularSideCount; i++)            {                triangles[curIndex++] = startIndex;                triangles[curIndex++] = startIndex + 1;                triangles[curIndex++] = startIndex + 3;                triangles[curIndex++] = startIndex + 3;                triangles[curIndex++] = startIndex + 2;                triangles[curIndex++] = startIndex;                startIndex += 2;            }            return triangles;        }

4、 取得UV坐标的数据汇合

 protected override Vector2[] GetUVs()        {            int curIndex = 0;            int arrayLen = (_circularSideCount + 1) * 2 + (_circularSideCount + 1) * 2;            var uvs = new Vector2[arrayLen];            //底面            uvs[curIndex++] = new Vector2(0.5f, 0.5f);            for (int 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 (int 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            float value = 1.0f / _circularSideCount;            for (int i = 0; i <= _circularSideCount; i++)            {                uvs[curIndex++] = new Vector2(i * value, 0);                uvs[curIndex++] = new Vector2(i * value, 1);            }            return uvs;        }

整体成果如下：

gitee仓库地址：https://gitee.com/pangdudu010...