There is four questions I want to know!

[kstcmcjw]

Hello everyone, through those days study of EGS, i like this software step by step, programmed by myself, simulation the examples from getting-start.pdf, sometimes i succeeded, but there still many troubles i must to face. Some problems i ask below:

1. I simulation the chapter 5.4 (Generate particles tracks) of getting-started.pdf , add the single geometry to the compound geometry one by one. But the EGS_VIEW faild, it was loading the .egsinp file a second and went to crash!
   Here is my program:

   :start geometry definitaion:
   
       :start geometry:
           library = egs_box
           box size = 500 500 500
           minpoint=0 0 0 
           name = air_box
           :start media input:
               media = AIR521ICRU
           :stop media input:
       :stop geometry:
       
       :start geometry:
           library = egs_genvelope
           name = phantom_in_air
           base geometry = air_box
           inscribed geometries = phantom
       :stop geometry:
   
       simulation geometry=phantom_in_air
   
   :stop geometry definition:
   

   I think my geometry is right, but what is the mistake? And why the egs_view is crash either?

2. Is the library and type is the fixed format? For example, in EGS_ConeStack Class Reference, “library = egs_cones & type = EGS_ConeStack” ,it mustn’t be “library = egs_cones & type = EGS_Cones”?

3. Why the “axis” have six numbers, I mean axis = Ox, Oy, Oz, ax, ay, az, I know the axis key defines the axis of all cones as a position (Ox,Oy,Oz) and direction (ax,ay,az), O stands for position, such as -1,2,0 in three-dimensional, but direction (ax,ay,az) stand for what? Such as “axis = 1.2417 0 0 -1 0 0”, what about “-1” means? Negative half shaft of X?

4. In EGS_PlanesT< T > Class Template Reference, the key value pairs is:
   library = egs_planes
   type = EGS_Xplanes or EGS_Yplanes or EGS_Zplanes or EGS_Planes
   positions = list of plane co-ordinates
   normal = ax, ay, az (only needed for type = EGS_Planes)

   It seems there the plane’s position contains three site: ax, ay, az. But in some examples of Report PIRS-898 (2019) there is two positions as the follows:

   

Thanks for your answer!

[ftessier]

1. There is a typo in :start geometry definitaion: (definitiaon), I don't know if this will resolve the problem...
2. Yes, it is ConeStack for a cone stack; there are various geometries in the cones libary, the type allows you to pick which one.
3. The axis defines the axis and direction of the set of cones; for example, -1 0 0 means that the layers of a cone stack are added one after the other along towards the negative x axis direction.
4. There can be 2 or more positions: these are the distances along the axis (defined by the normal) where the planes are located: there are n-1 regiones defined by n positions.

[kstcmcjw]

1. 有一个错字:start geometry definitaion:（定义一个on)，我不知道这是否能解决问题...
2. 是的，它是锥形堆的 ConeStack；圆锥库中有各种几何形状，类型允许您选择哪一种。
3. 轴定义了一组锥体的轴_和_方向；例如，-1 0 0表示锥形堆叠的层沿着_负_x轴方向一个接一个地添加。
4. 可以有 2 个或更多位置：这些是平面所在的沿轴（由法线定义）的_距离_：有_n-1 个_区域由_n 个_位置定义。

1. Oh, thank you very much, apologizes for my carelessness of spell mistake, first problem has solved, the program runs OK.
2. I search the library=egs_cones, find there are some types, such as type=EGS_conestock; type=EGS_simplecones and type=EGS_coneset,
   there is another question, it seems the library=cylinders and library=egs_cones can all achieve the cylinder's simulation. But what is the different? Only is the simulation's process?

3.4. Yes, thank you for your advice, i simulation the geometry in my brain at first, and then draw a picture of 3 and 4 question.

5. There is two additional question i see the example of PIRS-898 (2019), what is this four numbers(0,0,1,0) stand for? The picture is below.

6. For ax,ay,az or ox,oy,oz? And whether the ox,oy,oz is only two conditions-- -1 and 1, stand for the negtive and positive of axis?

[kstcmcjw]

1. 有一个错字:start geometry definitaion:（定义一个on)，我不知道这是否能解决问题...
2. 是的，它是锥形堆的 ConeStack；圆锥库中有各种几何形状，类型允许您选择哪一种。
3. 轴定义了一组锥体的轴_和_方向；例如，-1 0 0表示锥形堆叠的层沿着_负_x轴方向一个接一个地添加。
4. 可以有 2 个或更多位置：这些是平面所在的沿轴（由法线定义）的_距离_：有_n-1 个_区域由_n 个_位置定义。

Hello?