Please help, this is quite important for me.
I am a novice in Inkscape and would like to learn some basics by trying to re-create a sample image in vector format.I am familiar with paint.net, but by no means pro. My goal is re-creating a professional logo in vector format for someone.
So far I have managed to:
Trace the frame on a layer above the original using Bezier curves and editing them.
Apply fill and set Miter limit to get sharp points (join of two lines).
Align image on grid points to get correct ratio's and perpendicular lines.
Now I am stuck at creating the lighting/shading effect. It appears to be some kind of point lighting or shade filter.
I have tried:
1) After looking at the filters available and reading this: https://www.packtpub.com/books/content/inkscape-svg-filter-effectsI tried to use
Specular light (only created weird 3d contour lines, not what I expected)
Diffuse light (same as above)
2) After looking at gradients and reading this:http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Attributes-Fill-Stroke.html#Attributes-Gradients I attempted with gradients
Using a radial gradient with extra stops on each section to get a similar but not complete effect, but this does not provide the desired effect with shading from all directions. Gradient ( same color as my base fill, stop1=100% opaque,stop2=variable% opaque, stop3=0%opaque)
I then tried to layer multiple gradients by adding multiple layers, each with their own effect, using variations of Multiply on the layers as well. But this has proven quite difficult to do effectively.
(Also grouping the objects and applying a gradient to the group seems to cause problems when duplicating the layer, it is as if the gradient object is layer independent - it either has no effect or the top-most layer keeps getting selected)
Basically, my gradient attempts have been unsuccessful even after further reading and playing around for hours.
Any help, examples or direction would be hugely appreciated.
Could someone help me upload attachments. All files say 'extension not supported'? I wanted to upload the .svg file with the vector based trace and original image.
For now here is the image I am using (the square above)

My vector trace
