Hello
When I want to make the 3 blue lines collinear with the 3 black lines, I must switch to wireframe. Is this normal or is an option not checked?
Thank you for your answers.
Cdt
Fred
Hello;
By default, Solidworks only allows you to select what is visible.
But some settings are available for selections in shaded mode...
See the settings of the " Selection " tab:
https://help.solidworks.com/2022/french/Solidworks/sldworks/HIDD_OPTIONS_SELECTION.htm?rid=158283
If you are in a room and sketch upon sketch, you must uncheck the " Shaded Sketch Outline" option (Sketch Tools/Settings menu).
If you are in an assembly: sketching on 3D: The wireframe mode or the hidden edge preview mode is suitable, otherwise you have to right-click on the volume component and then " Select Other " as many times as necessary to visualize the edge to be constrained...
Otherwise there is always the option " Convert entities ", it doesn't change anything in the selection mode (wireframe) but when you have to constrain three out of four lines, the question arises...
5 Likes
yes and no, because he has the " chamfers " to subtract => so much work 
Otherwise, to answer you @fred : it depends on where the plane of your sketch is in relation to your visible surface:
If your plane is " above " the visible surface: no worries to select directly
If your plane " cuts " the room and is therefore below the visible surface, it doesn't get too good at it. The easiest way is to move in space to select the face rather than the line and perform your collinearity constraint
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To select an edge of a room in transparency without going through wireframe mode, press shift + click on the edge.
4 Likes
Hello and thank you all
Cdt
Fred