gizmos是场景视图里的一个可视化调试工具。
在做项目过程中。我们常常会用到它，比如：绘制一条射线等。
unity3d 4.2版本号截至。眼下仅仅提供了绘制射线，线段，网格球体，实体球体，网格立方体，实体立方体，图标。gui纹理，以及摄像机线框。
假设须要绘制一个圆环还须要自己写代码
using unityengine;
using system;
public class hegizmoscircle : monobehaviour
{
public transform m_transform;
public float m_radius = 1; // 圆环的半径
public float m_theta = 0.1f; // 值越低圆环越平滑
public color m_color = color.green; // 线框颜色
void start()
{
if (m_transform == null)
{
throw new exception("transform is null.");
}
}
void ondrawgizmos()
{
if (m_transform == null) return;
if (m_theta < 0.0001f) m_theta = 0.0001f;
// 设置矩阵
matrix4x4 defaultmatrix = gizmos.matrix;
gizmos.matrix = m_transform.localtoworldmatrix;
// 设置颜色
color defaultcolor = gizmos.color;
gizmos.color = m_color;
// 绘制圆环
vector3 beginpoint = vector3.zero;
vector3 firstpoint = vector3.zero;
for (float theta = 0; theta < 2 * mathf.pi; theta += m_theta)
{
float x = m_radius * mathf.cos(theta);
float z = m_radius * mathf.sin(theta);
vector3 endpoint = new vector3(x, 0, z);
if (theta == 0)
{
firstpoint = endpoint;
}
else
{
gizmos.drawline(beginpoint, endpoint);
}
beginpoint = endpoint;
}
// 绘制最后一条线段
gizmos.drawline(firstpoint, beginpoint);
// 恢复默认颜色
gizmos.color = defaultcolor;
// 恢复默认矩阵
gizmos.matrix = defaultmatrix;
}
}
把代码拖到一个gameobject上，关联该gameobject的transform，然后就能够在scene视图窗体里显示一个圆了。
通过调整transform的position。rotation。scale，来调整圆的位置，旋转，缩放。
补充：基于unity3d使用linerender组件绘制圆线
在此记录一下使用unity3d 的linerender绘制线的过程，经过测试linerender与opengl的gl_line_strip绘制方式一样，因此计算完点之后需要把起始点即为终点，多算一个点才算闭合。
代码如下：
using system.collections;
using system.collections.generic;
using unityengine;
using unityengine.ui;
public class drawlines: monobehaviour
{
public float m_radius = 1.0f;
public material m_material;
public float m_linewidth = 1.0f;
private list<vector3> vpath = new list<vector3>();
// start is called before the first frame update
void start()
{
int count = 60;
for (int i=1; i<= (count+1); i++)
{
if(i == (count+1))
{
float x = mathf.cos(2 * mathf.pi / count) * m_radius;
float y = transform.localposition.y;
float z = mathf.sin(2 * mathf.pi / count) * m_radius;
vpath.add(new vector3(x, y, z));
}
else
{
float x = mathf.cos(2 * mathf.pi / count * i) * m_radius;
float y = transform.localposition.y;
float z = mathf.sin(2 * mathf.pi / count * i) * m_radius;
vpath.add(new vector3(x, y, z));
}
}
gameobject linegroup = new gameobject("linegroup");
gameobject lineobject = new gameobject("radarline");
linerenderer line = lineobject.addcomponent<linerenderer>();
line.material = m_material;
line.useworldspace = false;
line.positioncount = vpath.count;
line.startwidth = m_linewidth;
line.endwidth = m_linewidth;
line.setpositions(vpath.toarray());
}
// update is called once per frame
void update()
{
}
}
运行一下看一下效果：
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。如有错误或未考虑完全的地方，望不吝赐教。
