family parameter "tank's access chimney "

[REDO10]

Hi All,

Hi @RDAOU 

I need your help to create my tank's access chimney which has the form in the picture below

I tried to create my family using a generic model nested in the geometry of my dome but I cannot create the intersection void between the chimney and the dome (REVIT sayed me: impossible to cut family1 occurrences from their host!!)

please check my attached family file bellow for any suggestion or correction

Have a nice day

Thanks.

[RDAOU]

@REDO10 

Do you really need a family for that?

Unless you have 10s or 100s of these chimneys, you can just use walls and attach their base...or use a simple extrusion and cut it with an in place model...

[REDO10]

@RDAOU 

Yes I need to model a family that I can use for my different tank projects

Please take a look at my attached file ... I followed the steps that you indicated to me in my subject

https://forums.autodesk.com/t5/revit-architecture-forum/sump-shape-modeling-parameters-using-concept... ... but the intersection void between the chimney and the dome does not want to be created !!

Notice that I use REVIT 2021 version

Thanks.

[ToanDN]

Create the chimney family as a Architectural Column family, place it in project, and attach the Base to the roof.

[syman2000]

Looks like your opening void is set to an arc. Normally this will not work because Revit has tendency to break when you have arc solid shape so close to the surface. You want to add extra tolerance to allow the void cut. If the dome shape is 150mm in thickness, you want to make the void 151mm or more to get your cut.

[RDAOU]

@REDO10 

How did you the Tank Cover? 

[REDO10]

@RDAOU 

The tank cover is a geniric model with revolution (two half dome)

Thanks.

[RDAOU]

@REDO10 

Here is the simplest I can think of

• Tank Cover (Generic Model)
  1. Add a Dome Shaped Void below the cover
  2. Check the option Cut with Void when loaded
• The Chimney (Generic Model)
  1. Add a Void inside Chimney walls
  2. Can set it to adjustable height (Edit/check attached sample)
  3. Check option Cut with Void when loaded

Load Both into model >> Place Cover >> Place Chimney and adjust height parameter

1. Use Cut Geometry >> Select Cover >> Then Select Chimney
2. Use Cut Geometry again >> Select Chimney >> then Select Cover
3. Use Join Geometry if needed

[REDO10]

@syman2000 

indeed that escaped me !!
I corrected that and I increased the thickness of the void to have the desired cut

Thanks.

[REDO10]

@RDAOU 

Thanks for your reply

your idea is simple and practical...sometimes I complicate my life!! 🙄 
I have some questions:
1- It's necessary to model the cover with his nested void as a family? ...why dont do that directly in the project by a generic model then add a void bellow it..it's not work?
2- Why you have set an offset of 600mm from the reference plan in the chimney family C1? (it can be more or less??)

I tried to load directly your chimney C1 in my project but that not cut correctly? ...I've add dome shaped void below the cover as you have doing (see the picture bellow)

3- how can I fix the chimney directly in extremity of the cover using radius R (in your example the chimney can be placed in any point of plan)

Thanks.

[ToanDN]

Here is how I would do it:

• Model a dome mass
• Roof by face
• Model a column family with a void, cut with void when loaded
• Place family on roof, attach it's base the roof
• Cut geometry column and roof to create the hole

[ToanDN]

[RDAOU · Accepted solution]

---

@REDO10 wrote:

1- It's necessary to model the cover with his nested void as a family? (RD) When I suggested that you model all in place, you said you want families 🙂 so why not have the cover as a family too? As previously stated you do not need families neither for the cover nor for the chimney ...why dont do that directly in the project by a generic model then add a void bellow it..it's not work? (RD) You can but in such case you will not use a void dome to cut chimney. You would use a Solid Dome below cover (with visibility parameter or subcategory to switch off) and u use Join / Switch Join order to cut chimney (attached a revised model with both methods)
2- Why you have set an offset of 600mm from the reference plan in the chimney family C1? (it can be more or less??) (RD) It is an instance parameter so it can be whatever you wish it to be

I tried to load directly your chimney C1 in my project but that not cut correctly? ...I've add dome shaped void below the cover as you have doing (see the picture bellow) (RD) as mentioned before...in such case you need to cut chimney with a solid using join geometry

3- how can I fix the chimney directly in extremity of the cover using radius R (in your example the chimney can be placed in any point of plan) (RD) Use Pythagoras. the radius is half the chord. 

Thanks.

---

[ToanDN]

@REDO10 

Revit 2019 file is attached here (I cannot attach file in DM).

[RDAOU]

@REDO10 

And here is the all IN Place solution

1. Cover: Model in Place - Category Floor 
2. Place Basic Walls and Attach base to Cover
3. Edit Cover and add Void extrusion to cut cover

Flexible >> pretty much quick and easy >> can have as much shapes as you need >> you gain access to all the Walls features >> Can be reinforced >> and works for your analytical model

[REDO10]

@RDAOU 

Hi,

---

@RDAOU wrote:

---

why dont do that directly in the project by a generic model then add a void bellow it..it's not work? (RD) You can but in such case you will not use a void dome to cut chimney. You would use a Solid Dome below cover (with visibility parameter or subcategory to switch off) and u use Join / Switch Join order to cut chimney (attached a revised model with both methods)

---

I'm exploring your attached file but I cannot switch on display of the solid Dome under the cover (with yellow color)

I entered the visibility parameters (VV ) and and I set In place cut element button on under floors category but cannot see it??

how to solve that?

Thanks.

[RDAOU]

@REDO10 

You use the subcategory when you want to switch off in specific views...To switch on/off in all views there is a Visibility type parameter

1. Scroll in the Project Browser to Floors
2. Floor 2 >> double clock the family type >>> check the Visibility parameter on

[REDO10]

---

@RDAOU wrote:

@REDO10 

And here is the all IN Place solution

1. Cover: Model in Place - Category Floor 
2. Place Basic Walls and Attach base to Cover
3. Edit Cover and add Void extrusion to cut cover

---

yes I see that the IN Place method with attach to base option is the simplest and easiest, but I prefer to create a family which I will use later.