I'm making a demo video of a product. I have a 3D model and animation of it. Do I need a physical prototype for a presentation to an investor?
This depends on the type of investor you are seeking. But if you are specifically seeking an investor for the purpose of building the prototype and running through the testing, the answer is no. The more you can do on your own, the better your leverage will be, but if you need an investor, better to give up part of your equity and have a product to sell than keep it all.
You do not need a physical prototype but a physical prototype is much more convincing to an investor since it shows you have done your homework. Again, it depends on the investor.
Even Kickstarter and Indiegogo projects do sell with a video demo and creative copy and no prototype to show.
Yes. My first physical prototype i submitted to an investor/mentor was at the age of 22 made out of cardboard, along with 3D models and motion simulations of the product. Something to visualize, touch, feel always helps.
Although it is beautiful to have the demo product or MVP built with some basic functionality working. My understanding is you don't need it always. It depends on what type of investors you are approaching. If you have 3D model and animation then honestly it should work. But again depends on investors.