Topic: Mirrored Block

[lightname]

Is there a way to insert a mirrored block? If not can I insert it, then select it and finally mirror it?

[mohnston]

Make the x, y or z value negative when you insert it.

[Bryco]

If you do need to mirror it after insertion, I've found you need to use a rotation matrix rather than a mirror whatever.
edit; Mirror it about a picked point using the x-axis as a vector and rotate about that same point using the following math.
Below is the guts part of a mirror function

Code: [Select]

protected override bool WorldDraw(Autodesk.AutoCAD.GraphicsInterface.WorldDraw draw)
            {

                if (mir)
                {
                    Vector3d V = Cs.Xaxis;
                    Plane P = new Plane(M1, V);
                    transMat = Matrix3d.Mirroring(P);
                    NewAng = Math.PI * 0.5;
                    mir = false;
                }
                else
                    transMat = Matrix3d.Rotation((NewAng - Ang)*2, Pn.Normal, M1);

                Ang = NewAng;
                foreach (Entity draggingEntity in m_entitiesToMirror)
                {
                    draggingEntity.TransformBy(transMat);
                    draw.Geometry.Draw(draggingEntity);
                }
                return true;
            }  //End WorldDraw

[lightname]

mohnston: Thank you, that was just what I needed. So simple, yet I'd never have thought of it myself.

[Alan Cullen]

lightname,

I'm probably a bit late here.....but yes you can mirror a block......but any text in the block also gets mirrored, irrespective of the setting of MIRRTEXT.