How do I measure lengths on slanted surfaces?

[Anonymous]

How do I measure lengths on slanted surfaces from mass ?

[ToanDN]

Change workplane to the slanted surface and measure the distance.

[barthbradley]

sqrt(a^2+b^2)

Kidding 

[Anonymous]

revit refuse to make workplace at slanted surfaces at my case , ill send photo to see what i need .

[Sahay_R]

Create a reference plane, name it, align it to the slanted surface. When you go to set workplane, this will show up in the list of workplanes to select.

[chrisplyler]

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@Anonymous wrote:

revit refuse I DON'T KNOW HOW to make workplace at slanted surfaces at my case , ill send photo to see what i need .

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Open a 3D view. On the tool ribbon choose Architecture > Work Plane > Set and then choose the Pick a plane option. Now click on a slanted bit in your 3D view.

[Anonymous]

I completely mean Revit refuses to choose a surface
You can see that when I select the desired surface you will find that it chooses the intersection line ,not the surface and this is the problem

With your thanks and respect for your attention

[ToanDN]

Did you use Tab to cycle through the selection?

[Anonymous]

Certainly
I am an old user of the Revit program, and this will not be missed.

Respect and appreciation,

[ToanDN]

Maybe the surface is not planar, but warped.  Create an adaptive generic family with two points and snap it where you want to measure, then list the length.

[Anonymous]

I think you are correct , i'll try to solve it ,

Thanks

[Alfredo_Medina]

@Anonymous

You cannot select a surface because the option for selecting elements by surfaces is off. 

This is a screen capture of the taken from image that you posted:

[ToanDN]

@Alfredo_Medina

I don't think that affects the ability to set the workplane by face.

[Alfredo_Medina]

You are correct. I just read post # 7 above, and in that post the user just says "Revit refuses to choose a surface" while his toggle button to select an element by surface is off. That post does not mention that what the users wants to do is to set a workplane. Now I know. 🙂