Blender modelling questions

G by Gorgious on 7 Jun 2022 # +2 votes

Since your 3D cursor is already placed at the right spot, you have to change the pivot point to "3D cursor", change the snapping to "Rotate" (face, edge, or vertex work the same, you just have to target the relevant geometry on the blue side), and rotate along the Z axis. Of course this can all be fast-forwarded with the relevant keyboard shortcuts :

N by Nigel on 7 Jun 2022 #

Hi I have another Blender questions, I think I accidently clicked a shortcut. Now every time I select object in Object mode and when I Tab into Edit mode those selected objects disappear. Please help :)

N by Nigel on 7 Jun 2022 # +1 votes

it was user stupidity

C by Coen on 15 Oct 2022 #

I am using the latest BlenderBIM version 0.0.221015.

These miter joins work really well with Beams, I managed to model this:

I rotated the beams 30° , modelled an IfcCovering on top, added an IfcOpeningElement, really nice how the new BlenderBIM version is coming along.

The only limit know is my limited knowledge of Blender modelling, I keep getting lost, why stuff will or won't work. For example.

I used G -> G to do an edge slide

I want to make the face of the IfcCovering parallel with the face of the end of the IfcBeam

Same with this opening, I made an edge loop and now I want to extrude this edge loop perpendicular to the face of the IfcCovering, But I don't understand how:

T by theoryshaw on 15 Oct 2022 # +1 votes

I don't know how to do it natively in Blender (am curious, if possible), but here's one way, using CAD Transforms, as seen illustrated here, as well.

Here's a similar way to extrude that skylight frame.

C by Coen on 15 Oct 2022 #

@theoryshaw

Thanks a lot, :-), do you know also any way to snap the 3D cursor to the center of an edge?

T by theoryshaw on 15 Oct 2022 #

shift+right mouse button... make sure edge snap (native blender) is on.

C by Coen on 15 Oct 2022 #

@theoryshaw said:

shift+right mouse button... make sure edge snap (native blender) is on.

I don't get it, I must be doing something wrong

I don't see a snapping symbol when using the 3D cursor

T by theoryshaw on 15 Oct 2022 #

there's no snapping symbol (that's CAD Transform functionality)... It should just snap the 3D cursor to the edge, visually.

and this maybe...

B by baswein on 15 Oct 2022 # +1 votes

It's a little tricky. You need to make sure you have edge center on in snapping them hold shift while right clicking. The first click doesn't snap (odd right) but if you then hold shift and right mouse button drag it will snap to the edge center.

A by Ace on 15 Oct 2022 # +1 votes

If it's parrallel, In Blender Natively you can use the extrude manifold tool, it works like the push pull tool from sketchup

I can see your roof model is not parralell unfortunately, so it's a bit messed

C by Coen on 15 Oct 2022 # +1 votes

@baswein said:

It's a little tricky. You need to make sure you have edge center on in snapping them hold shift while right clicking. The first click doesn't snap (odd right) but if you then hold shift and right mouse button drag it will snap to the edge center.

Yes thank you, holding shift, that did the trick, I now also see the snap symbol (little yellow circle) when using the 3D cursor:

![] (https://community.osarch.org/uploads/editor/8v/llio56idttor.png "")

C by Coen on 4 Nov 2022 #

How do you enable snapping on intersecting edges on the same plane?

There's no vertex here or anything to snap to:

I want to place the 3D cursor on this point so I can extend the IfcWallType instance.

A by Ace on 5 Nov 2022, edited 5 Nov 2022 # +2 votes

It doesn't always work well but you snap in direction 1 and then drag it in direction 2

I use these snaps, i recently added edge perpendicular which seems to help

Start:

g

Snap in direction 1

drag it to intersection to snap to direction 2

edit: it works with the 3d cursor aswell which I have had the most problems snapping with

C by Coen on 5 Nov 2022 # +1 votes

@Ace

Thanks it works:

But is there a way to verify/confirmed it snapped at the desired location? Behaviour seems a bit strange at the outer grid positions

I woulld like to see the XYZ coordinates of the 3D cursor after it snapped somehwhere

Update, I see it under the View tab > 3D Cursor:

3D cursor won't snap nicely on the outer intersections of the standard IfcGrid in BlenderBIM

My snap settings:

G by Gorgious on 5 Nov 2022 # +2 votes

You can't snap at the intersection of 2 edges AFAIK. The TinyCAD addon shipped with blender has an option to create a vertex at the intersection of 2 edges that you can then use for snapping. Far from ideal solution though

R by RaphaëlVouilloz on 11 Nov 2022 # +6 votes

@Coen said:

Same with this opening, I made an edge loop and now I want to extrude this edge loop perpendicular to the face of the IfcCovering, But I don't understand how:

@theoryshaw said:

I don't know how to do it natively in Blender (am curious, if possible), but here's one way, using CAD Transforms, as seen illustrated here, as well.

Here's a similar way to extrude that skylight frame.

Natively in Blender I would use this quick trick. Select the face you want to be perpendicular with, then Shift+1 to be in front view relative to that selection. Set Transform Orientations to View, select your edge in an other window and extrude in Y from the first window.

M by Moult on 12 Nov 2022 # +1 votes

You can also select any face and use it as a new coordinate system in the same menu in the screenshot above.