[code] intersect_with example

[thomthom]

Hi,

I have tried to use two intersected cubes to demonstrate how to use the intersect_with command. This could be a example for the ruby doc.

Code: Select all


    model = Sketchup.active_model
    entities = model.entities

    #Create a group to collect all entities for base cube
    basegroup=entities.add_group
    basegroupentities=basegroup.entities
    p1 = Geom::Point3d.new(0, 0, 0)
    p2 = Geom::Point3d.new(2000, 0, 0)
    p3 = Geom::Point3d.new(2000, 150, 0)
    p4 = Geom::Point3d.new(0, 150, 0)
    p5 = Geom::Point3d.new(0, 0, 0)
    points = [p1,p2,p3,p4,p5]
    #Add a face entity into base group
    base = basegroupentities.add_face points
    normal = base.normal
    if normal==[0,0,-1]
      base = base.reverse! 
    end
    base.pushpull 1000
    base_trans=basegroup.transformation

    #Create a group to collect all entities used for cutting cube
    cutgroup=entities.add_group
    cutgroupentities=cutgroup.entities
    p1 = Geom::Point3d.new(500, -50, 500)
    p2 = Geom::Point3d.new(1500, -50, 500)
    p3 = Geom::Point3d.new(1500, 200, 500)
    p4 = Geom::Point3d.new(500, 200, 500)
    p5 = Geom::Point3d.new(500, -50, 500)
    points = [p1,p2,p3,p4,p5]
    #Add a face entity into cut group
    base = cutgroupentities.add_face points
    normal = base.normal
    if normal==[0,0,-1]
      base = base.reverse! 
    end
    base.pushpull 1000
    cut_trans=cutgroup.transformation
    
    #Use all entities in cut group to cut through all entities in base group
    #The middle basegroup variable is to specify that the intersection lines are drawn on base group entities.
    cutgroupentities.intersect_with false, cut_trans, basegroup, base_trans , true, basegroup 
    
    status = basegroup.explode
    model.active_view.zoom_extents
    UI.messagebox("Click to delete cut group.")
    cutgroup.erase!
 

[DavidBoulder]

Thanks, that was really helpful, but I'm having problems with a simple variation on this.

The basic concept is a model with only groups at the top level. The user selects a group and then runs the script. The script should intersect that group with the model; the new geometry is created inside of that group. My next step after this is working is to let the user multi-select and iterate through their selection. That should be easy if I can just get the basic code working first.

This is what I want for the intersect_with line, but I just can't get it to work. I guess I need to get the name of the group that is in selection[0]? and then use that similar to your code.

selection[0].intersect_with true, selection[0].transformation, selection[0], [0,0,0], true, entities

[TIG]

Your selection[0] will be an entity BUT the intersect_with method is for entities - that is the 'container-entities' holding that individual entity... see
http://code.google.com/apis/sketchup/do ... rsect_with
Recast it something like... selection[0].parent.entities.intersect_with(true, selection[0].transformation, selection[0].parent.entities, selection[0].transformation, true, entities)***
***I'm not sure what your final argument 'entities' is - it should either be an 'entities object' or an 'array of entities'... it could be selection[0].parent.entities.to_a so all entities in the same context are used in the intersection

[Dan Rathbun]

Someone please..

Codebox the script example, parenthesize the intersect_with call (it wraps,) and rename the topic title:
[ code ] Entities.intersect_with example
.. so that Jim's sticky code index script can find it.

[DavidBoulder]

TIG, thanks for you help. That got me over the hump. Below is what I was looking for. If you select one or more top level groups and run this script, it will iterate through the groups adding necessary intersecting geometry under each group.

Code: Select all

model = Sketchup.active_model
entities = model.active_entities
selection = model.selection

# loop through selection of top level groups to create new intersecting geomtry under each group.
selection.each { |entity|
entity.entities.intersect_with(true, entity.transformation, entity.entities.parent, entity.transformation, true, entity.parent.entities.to_a)
 }


[TIG]

I suggest you trap for non-groups

Code: Select all

selection.each { |entity|
###
next if not entity.class==Sketchup::Group
###
entity.entities.intersect_with(true, entity.transformation, entity.entities.parent, entity.transformation, true, entity.parent.entities.to_a)
}

Also shouldn't entity.entities.parent be entity.entities.parent.entities