It's available (as of right now) for PC, on iPad and also as a web app, which is what I use!
To see what other people have made using Catch, please check out the 123D Gallery - tons of amazing stuff on there. The portraits and buildings are especially neat! It might give you some inspiration to make your own Catch!
Step 1: Go out and take some photos!
Here are some tips for getting good photos:
- shoot in consistent lighting - a cloudy day is better than a sunny one, make sure if you're working indoors that the lights you're using aren't producing glare
- avoid reflective, highly glossy or shiny surfaces - they will not render correctly. You'll end up with holes in the model or entire sides will be missing!
- make sure your photos are in focus
- plan the shoot ahead of time and make sure that you are able to take photos all around the object
- the number of photos you take it up to you. I have taken everywhere from 15 to 40. Just make sure they're evenly spaced around the object! For a big (a few feet tall or more) object, I walk in a circle around it and I take a photo every two steps.
- make sure the object is the main focus of the photo - keep it in the middle and make sure all of it is in the photo. Only having half the object in the photo or including a photo where it's off the the side and something else is more in focus can cause rendering problems!