We could do with our davescm for this, but I think it is because what you have bought in from Illustrator, is a complex object, where as you need just the outline path so you can create a solid 3D object in Photoshop.
However, if I make a complex path inside Photoshop, I was still able to make a 3D extrusion directly from it. Note the first path in my screen grab below is a simple path, and the second a complex made by copying the first (dragging to the new path icon) Free Transforming it smaller, and pasting it to the original path with the Path operation set to Subtract. Note also that you need to have a layer selected for the make extrusion from path to work (it is greyed out otherwise.)
I am a babe in the woods regards 3D, and our Dave is the expert here, but he will be along shortly
I did take a look at this and can replicate it - but I have great difficulty in seeing why Photoshop sometimes classes a path as too complex and sometimes accepts it. I would echo Trevor's point. Try going over the detail with the pen tool keeping the number of points to a minimum.
As an example I drew three concentric ellipses with the freeform pen tool and go the message that the path was too complex. Drawing similar with the normal pen tool (using Bezier curves) the path was accepted without a problem.
So , in your case, I would try stroking the imported path onto a layer then going over it with the pen tool (not freeform pen tool) to create a new path and see if that looks simple enough to Photoshop.
Thank you Trevor and Dave for your replied. I'm not fully sure if you are suggesting what I have tried already which is to:
Convert the AI file to SVG and upload it as an image (File > Place embedded)
And then I went to 3D > New 3D extrusion from selected layer:
And this does turn this "complex" image into a 3D object. However, the curves aren't smooth, but have rough/distorted angles to them.
For images that I am able to paste in as a path and then turn into a 3D object, they have smooth curves and look like the original image.
I was suggesting bring your path in as you did before, then stroke the path with a brush (click on the icon at the bottom of the paths panel) to an empty layer so you have a pixel based version of your shapes. You can delete the path. Then get the pen tool and use it to draw a new path using those shapes on the temporary pixel layer as a guide. This should give a nice smooth path which will hopefully be accepted in the conversion. Finally extrude that new workpath to 3D.
Bit of work in that but it should give a good quality extrusion.
Thank you for your reply and helping out! Really appreciate it
I am not sure if you have Illustrator yourself, but if you do, open the object up in Illustrator again, make all the points active, and go Object > Path > Simplify.
This is a screen grab of your original that I have used Trace in AI, and you can see it has a lot of points.
I am not flash with AI, but I was able to half the number of points, with some 'issues' shall we say.
A bit of manual clean up would restore the shape, and reduce the number of points still more.
Thank you so much Trevor for this. I'm having someone trace the image for me. Noob question but is there a way they ca trace the image so that there is less of a chance for getting that complex error? Is less anchor points all that is required to ensure this?