MIT 4.202 Geometric Modeling Fall 2003
3D Modeling Tutorial		 prepared by: Haldane Liew
version: 2003.10.10

Tutorial Demo #1
Create a window opening in a wall.

Method #1
  1. Draw temporary guidelines to mark off location of the window along the bottom of the wall.
    2.
  2. Draw a rectangle 0.3x2.0 off to the side. Convert to plines if necessary.
    3.
  3. Extrude the rectangle 1.5 with no tapering.
    4.
  4. Move the rectangular solid to line up with the temporary guildines.
    5.
  5. Move the solid up (in the z direction) 0.5.
    6.
  6. Use the subtract command to cut a hole in the wall.
    7.

 

Method #2
  1. Use the ucs 3point method to change the ucs to be parallel with the wall. The first point should be in the corner between the wall and the stairs. The second point should be at the wall edge. The third point should be above the first point.
    2.
  2. Draw the outline of the 2.0x1.5 window. Use guidelines to help locate the window on the wall.
    3.
  3. Change the outline to plines if necessary.
    4.
  4. Extrude the outline 1.0.
    5.
  5. Move the solid block into the wall. Do you need to change the ucs to move the block into the wall?
    6.
  6. Subtract the block from the wall to cut out the hole.
    7.

Tutorial Demo #2
Draw a staircase

Method #1
  1. Draw the profile of the staircase in plan view: tread = 0.3, riser = 0.1786. Use copy multiple and pedit the whole thing together.
    2.
  2. Extrude the stairs 0.9 with no tapering.
    3.
  3. Move the staircase into place by using the align command. The three points you should use are the three points at the top of the stair that line up the the landing.
    4.

 

 

Method #2
  1. Draw the profile of the staircase in plan view: tread = 0.3, riser = 0.1786. Use copy multiple and pedit the whole thing together.
    2.
  2. Extrude the stairs 0.9 with no tapering.
    3.
  3. Move the staircase into place by changing the ucs.
    4.
  4. Change the ucs using 3points to be perpendicular to the bottom of the staircase.
    5.
  5. Use the rotate command and rotate the staircase upright.
    6.
  6. Use the move command and move the staircase into place by using object snaps to snap the top corner of the staircase to match the corresponding corner on the landing.
    7.
  7. It is good practice to return the ucs to the wcs.
    8.