Introduction: Model a 3D Jack O' Lantern in CREO
How to design a 3D Jack O' Lantern in PTC Creo 2.0 (or Pro Engineer, which is an older version of this CAD software)
Step 1:
1. Create center axis, a plane at 18 degrees (360/10/2) and a horizontal sketch of a vertical pumpkin slice section which edge touch the 18 degrees plane. (you should mirror the slice on the front plane)
Step 2:
2. Create a vertical sketch representing the outer edge of the pumpkin on the 18-degrees plane. The end should touch the end of the earlier created horizontal line.
Step 3:
3. Mirror the vertical sketch on the front-plane. Close the loop by adding another horizontal plane and sketch touching the top-ends of the vertical lines.
Step 4:
4. Create a boundary blend and make sure the lower horizontal line is tangent to the plane it was created on.
Step 5:
5. Pattern the boundary blend 10x around the center axis (divided by 360 degrees)
Step 6:
6. Merge the quilts, and rounds and mirror the whole around the top plane and merge again.
Step 7:
7. Add a hole in the bottom surface for the tea-light, by extruding a cut on the top-plane
Step 8:
8. Create an extrude on the front plane of the cut-out face. In this case a “smiley” I imported in sketcher from a dxf file I created earlier with Adobe Illustrator using an image downloaded from google images.
Step 9:
9. Create three copies of the same sketch on slightly different offsets from the top-plane which will become the pumpkin-stem-base.
Step 10:
10. Use these sketches to create a solid blend
Step 11:
11. Create a curved line, or several lines on top of the stem-base by first creating new planes under different angles.
Step 12:
12. create a solid sweep using the same sketch as the top of the stem-base. I used a trajpar relation in the sketcher to have the stem diameter become smaller to the end of the trajectory.
Step 13:
13. Thicken the surface model and add rounds between the stem and pumpkin.
You can finish the model by adding some nice appearance colors and by hiding the sketch lines.
Also I have added an offset on the teeth so that these will let some light trough when 3d printed.
I have rendered the pumkin in Keyshot 4, which gives fast and realistic results when rendering a final image.
You can finish the model by adding some nice appearance colors and by hiding the sketch lines.
Also I have added an offset on the teeth so that these will let some light trough when 3d printed.
I have rendered the pumkin in Keyshot 4, which gives fast and realistic results when rendering a final image.