Let’s say I have a cube 16x16x16 mm
In the middle of the top surface I wish to create an equilateral triangle 8x8x8 mm with its base parallel to the near edge. Then I want to extrude the triangular surface 2 mm down into the cube such that the finished article will be a cube with a triangle etched into its top surface.
This procedure must be one of the most common in Mechanical Design Modelling (with endless variations on the theme - boring holes, cutting keyways etc. etc. etc.) yet none of the video tutorials I have covers the subject and Mr Google is no help.
Would someone please either direct me to the appropriate video or step-by-step me through the process. To an absolute Rhino Newbie like me that would be one giant leap for mankind and much appreciated.