Houdini湖边小屋-使用到的节点及VEX Fuction（更新中）

今天药忘吃喽~ 2023-10-01 18:53 45阅读 0赞

**目录**

节点

1.attribute wrangle节点

2.blast节点

3.attribute create 节点

4.Tet conform 节点

5.fuse 节点

vex函数

1. rint()函数

2.int \[\] nearpoints(,,maxdist)

3.removepoint(0,point\_number)

4.detail 函数

5.setpointgroup

6.npointsgroup

7.rand(seed)

8.expandpointgroup

9.prim

10.point

11.vertex

12.primpoint

13.foreach

14.pop

15.primhedge

16.removevalue

17.removeprim

18.hedge\_nextequiv

--------------------

## **节点** ##

#### **1.attribute wrangle节点** ####

[Attribute Wrangle (sidefx.com)][Attribute Wrangle _sidefx.com]

写vex代码

#### **2.blast节点** ####

[Blast (sidefx.com)][Blast _sidefx.com]

移除group选定的geometry，可以选择删除的是points还是primitives，以及勾选delete的方式

#### **3.attribute create 节点** ####

[Attribute Create (sidefx.com)][Attribute Create _sidefx.com]

创建属性

#### **4.Tet conform 节点**  ####

[Tet Conform (sidefx.com)][Tet Conform _sidefx.com]

创建可以mesh的四面体网格

#### **5.fuse 节点** ####

常用的删除节点

## vex函数 ##

#### 1. **rint()**函数 ####

[rint (sidefx.com)][rint _sidefx.com]

四舍五入

#### 2.**int \[\] nearpoints(<geometory>,<pt>,maxdist)** ####

[nearpoint (sidefx.com)][nearpoint _sidefx.com]

找最近的点

int ptn\[\] nearpoints(0,@P,2.1)

#### 3.**removepoint(0,point\_number)** ####

[removepoint (sidefx.com)][removepoint _sidefx.com]

移除点

removepoint(0,@ptnum)

#### 4.**detail 函数** ####

[detail][]

detail(surface\_node, attrib\_name, attrib\_index);

例如：detail("/obj/geo1/attribpromote1", "area", 0);

#### **5.setpointgroup** ####

**[setpointgroup (sidefx.com)][setpointgroup _sidefx.com]**

给points分组，setpointgroup(0,"floor",@ptnum,1); 最后一个数是1则点被选择放入gropu中，如果是0则被忽略；

#### 6.npointsgroup ####

[npointsgroup (sidefx.com)][npointsgroup _sidefx.com]

group里点的数量 npointsgroup(0,"floor");

#### 7.rand(seed) ####

#### 8.expandpointgroup ####

[expandpointgroup (sidefx.com)][expandpointgroup _sidefx.com]

返回group里的点的num expandpointgroup(0,"floor");

#### 9.prim ####

读取面属性 prim(geometry,attribute\_name,primnumber)

#### 10.point ####

读取点属性 point(geometry,attribute\_name,pointnumber)

vector pos=point("defgeo.bgeo","P",3);//提取defgeo.bgeo几何体点3的position

#### 11.vertex ####

读取顶点属性 vertex(geometry,attribute\_name,linear\_vertex\_index)

#### 12.primpoint ####

[primpoint (sidefx.com)][primpoint _sidefx.com]

primpoint(geometry,primnum,vertex)

geometry:可以是几何编号（从0开始），也可以是个路径

primnum:顶点在的面的编号

vertex: 内部的顶点编号，0是第一个

**返回的是**：顶点连接到的点数，如果找不到对应点返回-1

#### 13.foreach ####

**foreach(\[element\_type value\];array)**

int array=\{1,3\};

foreach(int num;array)\{

...

#### **14.pop** ####

**[pop (sidefx.com)][pop _sidefx.com]**

po(&array)p移除某个列最后一个元素

pop(&array,index) 移除array中的第index个元素并且返回这个元素的value

#### 15.primhedge ####

primhedge(geometry,prim) 返回几何体中面的**任意**一个half\_edge

#### 16.removevalue ####

[removevalue (sidefx.com)][removevalue _sidefx.com]

removevalue(&array,value) 从array找到的第一个值为value的元素并移除并返回1，如果没有返回0

#### 17.removeprim ####

[removeprim (sidefx.com)][removeprim _sidefx.com]

removeprim(0,primnum,1) 意思是：删除面号为primnum的面，后面的数为1，表示**同时删除这个面与其他面无关联的顶点**

#### **18.hedge\_nextequiv** ####

hedge\_nextequiv(0,hedge) 找到跟hedge共端点的边

[Attribute Wrangle _sidefx.com]: https://www.sidefx.com/docs/houdini/nodes/sop/attribwrangle.html
[Blast _sidefx.com]: https://www.sidefx.com/docs/houdini/nodes/sop/blast.html
[Attribute Create _sidefx.com]: https://www.sidefx.com/docs/houdini/nodes/sop/attribcreate.html
[Tet Conform _sidefx.com]: https://www.sidefx.com/docs/houdini/nodes/sop/tetconform.html
[rint _sidefx.com]: https://www.sidefx.com/docs/houdini/expressions/rint.html
[nearpoint _sidefx.com]: https://www.sidefx.com/docs/houdini/expressions/nearpoint.html
[removepoint _sidefx.com]: https://www.sidefx.com/docs/houdini/vex/functions/removepoint.html
[detail]: https://www.sidefx.com/docs/houdini/vex/functions/detail.html
[setpointgroup _sidefx.com]: https://www.sidefx.com/docs/houdini/vex/functions/setpointgroup.html
[npointsgroup _sidefx.com]: https://www.sidefx.com/docs/houdini/vex/functions/npointsgroup.html
[expandpointgroup _sidefx.com]: https://www.sidefx.com/docs/houdini/vex/functions/expandpointgroup.html
[primpoint _sidefx.com]: https://www.sidefx.com/docs/houdini/vex/functions/primpoint.html
[pop _sidefx.com]: https://www.sidefx.com/docs/houdini/vex/functions/pop.html
[removevalue _sidefx.com]: https://www.sidefx.com/docs/houdini/vex/functions/removevalue.html
[removeprim _sidefx.com]: https://www.sidefx.com/docs/houdini/vex/functions/removeprim.html