Halloween is just around the corner which means it's time for our now annual PTC Jack-O-Lantern design contest!


'Jack-o'-lantern' photo (c) 2010, William Warby - license: http://creativecommons.org/licenses/by/2.0/

For the third year we're asking the best and brightest from the PTC Community to flex their PTC Creo muscles and share in the holiday-themed fun.


Known as the most recognizable symbol of Halloween, the jack-o-lantern has been staple of the season for as long as we all can remember. Every October, carved pumpkins dot porches and doorsteps in the United States and other parts of the world, showcasing dazzling designs inscribed with creative faces, illuminated by candlelight.


Being a relative new-comer to the world of 3D CAD software I've been so impressed by all the creations I've seen on the PTC Community so far, but don't know where to begin myself. Luckily my friend Bettina Giemsa spoke with Ian Pilkington last year to get the run down on how you would go about designing a pumpkin in PTC Creo.


How to design the perfect jack-o-lantern:


  1. Use a sweep with a graph-driven profile to generate the ‘segments’ of the pumpkin

  2. You could use a relation to work out how wide each segment could be so that it can be patterned round into a circle (to form the main bit on the pumpkin.

  3. Do all of this as a surface and then join all the surface segments together to form a ‘skin’

  4. Add rounds between each segment

  5. Solidify the skin into a solid with a relatively large thickness (i.e. as thick as you want to ‘scoop’ it out)

  6. Model the stalk on the top (Freestyle in PTC Creo would be great!)

  7. Project a cut into the side of the pumpkin from a sketch (scary face etc etc)

  8. To render, use one of the standard scenes but change the wall colors to dark or orangey type color….

  9. Use an environment light or a skylight to light the externals of the pumpkin

  10. Assign the color of the pumpkin to be yellow, and the external surfaces orange and green for the stalk. That way it will look orange on the outside whilst the scooped out bit will be yellow. You can play around with reflectivity etc to get the right result. You could also use a pre-set material like stone (but in yellow) to show the outside as a ‘rough’ texture.

  11. Place an additional light bulb light inside the pumpkin (with color set to yellow) to simulate a candle etc. (you could even model a candle to make it look more effective.

  12. Set perspective view and you are good to go!

Now it's your turn!


We have created this photo album for you to upload your jack-o-lantern designs and to vote for your community favorite. You can make your design, scary, spooky, fun or humerous (PG-rated of course) and the we'll let the community vote for their favorites. On November 14th, 12pm noon EST, we will take a look at all the submissions and pick the top 3 designs with the most “likes”. All three winners will receive prize pack of PTC gear. Naturally, all submissions must be created using PTC software in order to be considered for eligibility.


For more inspiration you can check out the sumbissions from 2012's design contest photo gallery and the halloween-themed renders from previous years.


Design a jack-o-lantern and upload yours today!


Can't wait to see what you all come up with, Happy Halloween to everyone from the PTC Community team!