Hello
I attached a Attempt 2 Fox Head.stp. I marked up the discrepancies of the model with respect to the image (FoxHeadMarks.jpg).
Also, a pdf file for more detailed information.
The model is composed mostly of curved faces. 
Can you please advise about how to adjust the model accordingly? I will appreciate any help.
Thank you.
You cannot Sculpt a .STP file, at lest not with the Sculpt tools available in Fusion 360. What was imported looks like it was a Mesh once but in the .stp file its all NURBS surfaces, which cannot be sculpted in Fusion 360. Do you have this available in the original .f3d format ?
Error: Failed to convert the face to T-Spline
Hello Peter,
I will be sharing the model (FoxHead-JC.zip) I created from Inventor. Attached is Inventor Model Feedback.pdf for guidance.
The model is different from the STEP file 
minus the concave/convex parts in the tail (better refer to the clay model from the attached FoxHead Design Advise PDF for better picture about the model).
Let me know if inventor part is good start 
or do you want me to create a fusion file version
.
Thanks
Jerome
I am somewhat surprised at how you are approaching this problem. My guess would be that you are lacking some understanding of basic geometry types.
The NURBS patch layout of the original file as shown in your first post was indicates that this design was created with a Sub-D modeling technique. Only the hole and the zig-zag cut in the tail were later applied using solid modeling.
If the design was originally created in PTC Creo then the base geometry before these solid modeling features were applied were most likely created with PTC Creo FreeStyle, which is a Sub-D modeling plugin for Creo. Similar to T-Splines that Mesh object was then converted to NURBS surfaces or a solid and then the already mentioned solid features were added.
NURBS are also controlled by meshes of control points somewhat similar in concept to the control cage of a Sub-D model or a T-Spline control mesh in Fusion 360. In some 3D software packages after import you can directly manipulate this mesh of NURBS control points, e.g. Solid Thinking Evolve, Maya, Houdini and a few others. However, in Fusion 360 and I would believe also Inventor you don't have direct access to this and as such the smallest element you can work with are the NURBS patches or surfaces.
In Fusion 360 and again I believe this applies to Inventor as well, you can convert a T-Spline into NURBS. You can also convert individual NURBS patches back into T-Splines, however the T-Spline mesh you get from that does not match the control point mesh of the NURBS surface. The only software I am aware of that allows you to export a NURBS control mesh as a .obj is Solid Thinking Evolve.
It looks like you spent some considerable time in inventor to re-design this design with the tools available in Inventor. Now you're stuck with solid modeling and NURBS surfacing techniques, which make the required edits to this painful and slow. For comparison, using a Sub-D mesh you'd be done with these edits in less time it took me to write this post.
As you now have a Solid Model, I am not exactly sure what advise you are looking for and what help you need.
Dear Peter,
Thank you for sharing your thoughts about the different types of geometry. My background is limited to Autodesk Inventor. I am a beginner in Fusion 360 specially in the Sculpt Workspace (T-Spline). I am here to learn.
The step file was just a reference to create the desired model. I have no idea who created the file. I only knew about it was done in CREO Parametric from the inventor translation report.
I am willing to spend sometime to create this model. You can forget about the inventor model. Since I posted this here in F3D, do you have any suggestion how to model it from scratch using Sculpt (T-Spline) or could be a combination of parametric modeling? 
Or are you saying its not possible? 
Maybe Solid Thinking Evolve is the answer? (then Autodesk should acquire them 
)
Thanks for the help!
Jerome
Is this professional work or just a personal practice piece ?
I've made some progress in converting individual NURBS patches into T-splines and merging adjacent vertices to arrive at somewhat cohesive T-Spline bodies. I can create a screencast ;later if there is interest. It's not a perfect match but fairly close. However, you will not be able to get to the original mesh layout that was used to create this model. But it might be close enough to continue to edit and refine the model.
Sorry for the delay. her is a screencast that demonstrate the technique. After creating the individual T-Splines, corrections will need to be made, so that these surfaces intersect each other properly, so you might be able to create a solid using the boundary fill tool in the Patch environment.
This is an awesome video Peter!
Thank you for sharing your amazing techniques/skills. This is gold for a newbie like me.
I wonder if it is doable if I will model/sculpt it from scratch? 
I'm sending positive thoughts to you in return! God bless you!
