08.09.20

1.The way of creating a new 3d-solid

psolid->AcDb3dSolid();

psolid->create...

 

2.booleanOper() has three ways :unite,intersect,subtract.

 

3.ways of transforming:

setToProjecting

setToRotating

setToScaling

setToTranlation

 

then,

pSolid->transformBy(xform);

 

4.Acad::ErrorStatus es=***;

It is a good way to judge an operation has been done correctly or not ;

 

5. 8*atan(1)=2*PI()=360 Degrees Celsius;

 

   atan(1)=PI()/4=45 Degrees Celsius.

 

6.spire=a poly + an region

 

7.regionIds.at[0];

 

8.AcDb3dPolyline(AcDb::k3dSimplePoly,points,true);

 

What does the word true mean ?

It means the polyline will be created is closed,not open.

A line will be drawn to join the end point and the start point.

 

9.erase();

Not means deleting the entity.

It sets the deletd bit open,if you close the entity,it will not be saved.