Can't constrain sketch lines to geometry lines, trying to make a car body

[Anonymous]

I have a school project where I'm supposed to make a vehicle assembly (we use Autodesk Inventor Pro 2018 at school), and I wanted to make the body using freeform to make get some good marks, and I followed a tutorial (https://www.youtube.com/watch?v=WkDlwHmZVpQ) but when I got to making the wheelbase, the sketchlines both turned green(which didn't happen in the video, don't know what that means) and when I used project geometry I couldn't constrain the sketch to the lines. I am kinda new to autodesk inventor so if somebody responds please go into gruesome detail and just assume I have a negative IQ, I don't know many of the terms.

[Mark.Lancaster]

@Anonymous 

Welcome to the Autodesk User's Community..

This video is over 16 mins can you clarify what time stamp this workflow is at.  In addition if you're new to Inventor and free forming already, seems like a newbie should be mastering other techniques before going to free-forming.  Has you class gone through the basics?   Also what does your instructor say about your issue?

[Cadmanto]

Might I suggest that your first project with Inventor not be a car body?  How about going through the tutorials within Inventor along with Youtube training videos.  This way you at least gain some knowledge of the software.  Then you can push that negative IQ status to the positive side.

Windows 10 x64 -16GB Ram
Intel i7-6700 @ 3.41ghz
nVidia GTS 250 - 1 GB
Inventor Pro 2018

[johnsonshiue]

Hi Arvid,

Let me put it this way. If you want to use Freeform workflows in Inventor, you need to have the following in mind.

1) Freeform best works for pseudo-organic shape (rounded). If your vehicle is like that, it may work.

2) If you want Freeform to be precise at certain region or piece of geometry, you may end up with something even more complicated.

3) Constraint and Freeform can run against each other. Freeform, by its definition, is supposed to be as free as possible.

Many thanks!