How to recreate the silhouettes of a model?

solo

I am not sure I completely understand what you are trying to achieve however have you tried extruding each face then intersecting them and removing the unwanted parts, or using 'Booltools' (a bolean toolset)?

solo

sepo

I think he was after simple 2d drawings in order to check sizes against the rock he would use for sculpting...at least that is how I understood.

FenS

Hi Solo,
I can understand that it was not exactly clear what i was looking for, but Sepo is right. (thanks anyway of course for the advise!)

I have read and seen tutorials about making a model based on three pictures (for instance making a car), but what i was looking for, whas the other way around. I have a 'car', but now i was looking for the three pictures.
Well, actually, i was looking for the three pictures because i could use them to find the right size of stone like Sepo mentioned, but after that i am only using one of those 3 pictures and actually need another second picture.
I'll try to explain.

Once I have the three drawings, I know what the minimum size of the rock that I am going to work with should be. I now have got a picture of the front, (thanks Nemosuke) so I can draw this one on the front (the yellow one in the next attachment) and the reverse picture (the same yellow one) on the back and easily start removing everything. (The model you see right now is a result of this step)

Now it is time for the left and right side (the blue one). (In this example I have taken the same shape, normally it would be another shape).
What I would like to do, is to take the print that I have of the left and right side (the blue one) and draw it upon the statue. But this would only be possible if had not removed the stone in the first step.
So basically what I would have to do, is to draw the green one in order to get the blue one in parallel view.
So here’s the question. Is it possible to recreate the green one (being able to print it) if I have got a model which will show the blue print in parallel view?
(In this case, the left side will also have the same blue one in parallel view, but will result in another green one).

FenS

One more, which might help.

let's say if been playing with SU and created the next model that I like and I decided that I wanted to make this out of stone (or some other material).
I know by now that it is possible to create the yellow picture.
But is it possible to generate the green and the red one in such a way that I can print it?

sepo

Are you again talking about 2d elevation view? If you are than you should do it again in a same way.Go to camera, parallel projection. You should have views toolbar activated. That will give you all 2d views which of course can be printed.
or are you saying you would like to unfold it and than print it? If that is the case than you can use Jim's plugin
which you can download from here http://sketchuptips.blogspot.com/2007/08/plugin-unfoldrb.html

FenS

Hi Sepo,

this is why i really like this community forum. I've been thinking on how to do this for some months (before i had even heard about SU) and for some days now that I know SU and after posting my question it is already solved...
Yes, indeed I was looking for something to unfold (didn't know that word) the green part. Didn't know the plugin existed (or what to look for), and i just read some of the comments and that really sounds great!
Thanks for the link and your fast reply!
One happy sculpturer

Gaieus

Hi Fred,

First I thought simply using the drape tool would do it but then it only likes to work verticall. There is a nifty plugin by Didier however: "project_faces_plane.rb" (it's also included into his projection projection tools above this plugin). With this you can simply project any shapes onto planes and this way getting all the desired 2D, parallel projection views as geometry. Find it here:
http://www.crai.archi.fr/RubyLibraryDepot/Ruby/em_geo_page.htm

FenS

Hi Gaieus,

i will sure check this one out but tonight I started playing a little with the unfold and
And because I asked this for using it with sculpturing, I made something (out of 'piepschuim'(foam?)). Next time I will use stone again.
So now I can use SU to make a model I like instead of trying to draw it on paper in 2d and hoping that everything can be made in 3d.
Thanks for all of your help and with this help I was able to make the following.

the drawings i made in SU thanks to your help

After printing

using the first drawing

after removing everything outside the lines

Normally i would have to do some difficult type of drawing...

...but now it is much easier

so this is the drawing how it really should be

and then this is the result.

plot-paris

nice sculpture, Fred. and thanks for the image-documentation. it is great to see SketchUp being used for different purposes. and what you do is definitely an exciting area.

now that you have found an ideal way to get your models from bits and bytes to stone and foam, your next challenge will probably be to rise the level of complexity of the models. I would suggest you have a look at Whaats Subdivide & Smooth script. it is definitely worth the money.
(of course I am telling you this with the hope, that you will keep us posted with images of your projects )

sepo

Looking good and I am glad it worked for you..

FenS

Hi Plot-Paris,

I've heard a lot about it and indeed i think it will be inevitable

And i sure will keep you posted if i have created a real sculpture from stone with the help of SU. I always make pictures of my "WIP" and SU sure is an extra dimension!

Unfortunately it is in Dutch but here is an example: http://home.tiscali.nl/beeldhouwer/htm_bld83.htm
(C&C are welcome of course, also possible on the homepage itself ('Naar alle beelden', 'Home', 'bericht achterlaat') or directly in http://www.koekjes.net/cgi-bin/gastenboek/schrijven.pl?rodin) (nice to see visitors from outside the Netherlands

For this statue i did a lot of calculating, something that would have been sooo much easier in SU...

Afterwards i drawed this one as an exercise:

opa (small).jpg

FenS

Today i am starting (to give it a try that is) with a real statue.
I received a model from Solo of a dog and i think this will be my subject. I want to try to create a real statue and along the way i will take a look at the problems i am facing with a real one instead of a simple imaginary one that i made up before.
Well, i have just found the first challenge.

Is it possible to automatically create faces if you have the outlines, but not the faces?
I mean, suppose you would have made a square and divided it with a line (like an '8') then SU would automatically create 2 faces. Suppose you would have selected both faces and deleted them, than you only have the '8' left without the face.
Well, this i like the situation i am having right now. A lot of connected lines but all without the faces.
Is is possible to let SU create all of them? Or do i need to use some plugin?

Thanks again!

PS all the lines are 'coplanar?' (i am already trying to find an answer in this giant forum, a lot of post regarding faces

Gaieus

Hi Fred,

If you draw a giant face (say a rectangle) coplanar with and on the (already) coplanar faces, select all > right click > Intersect > ...selected or model, you should end up with all the linework merged into the face thus creating the individual, split faces.

Delete the excess of the rectangle and you are there.

Also,the drape tool and the plugin I linked above are just for this.

FenS

why didn't i think of that? And then to think that all the lines were even already on this big rectangle (i did use the "project faces on a face" you mentioned earlier). Thanks, that does the trick, although now i am having a 'flat' projected dog with a lot of faces, of which a lot seems to be normal and a lot are reversed so still not really able to pushpull...
Clicking 3 times (selecting the entire projection and 'reverse faces' does not exactly what i want and in this case it is 'impossible' to select every single face that i have to reverse.
I will try to find a solution myself, but if you feel like helping...

Gaieus

Right click on just ONE face (that is oriented correctly) > "orient faces". If there are no inside faces in a "solid", it should orient all the faces in the same direction. (Sometimes unpredictable however )

FenS

indeed it seems to be acting unpredictable, but i have played around with it a lot, so i guess i will start all over. Thanks for the tips so far!

caddict

There is the Create Face utility which I think comes bundled with SU. (I think you have to enable it in Window > Preferences > Extensions > Utilities Tools)

If you have the outline of a shape, (no internal lines crossing the outline) AND all lines are coplanar AND form a closed loop, Tools > Utilities > Create Face should fill it for you.

I use it so often it has been assigned the shortcut "F". But it is fussy...any hint of non-planarity, or the slightest gap in the outline and...no go

(It sounds like you need to delete all the internal edges before using it)

PS, nice thread, interesting stuff and now I know about the unfold script...very useful! And, very nice sculpture work!

FenS

Hi Caddict,

thanks for your (c)advise. However, i had about a thousands of lines so obviously i was doing something that could have been done in a better way

This evening again i am trying to do it in a different way but man, what i think of at night never seems to work in the evening

FenS

Feel like having gold in my hands, not knowing what to do with it.

Like i said before Solo handed me a model of a labrador and this is the kind of thing i want to use to make a tut about making all the drawings needed for making this out of stone (or plaster (y-tong) first).

But how do i do this?
I need a print of the silhouet of the dog, this is easy (i know now) (camera, standard views, front etc)
This i could use first to remove all the stone from one side, but then i need the print of the green one in the beginning of this thread.

The way i thought of doing this:

copy the dog, move it to the left and to the back.
create a 'projection on face with faces' to the wall on the right of dog-1,
create a 'projection on face with faces' to the wall in front of dog-2,
(see attachment-1)
select dog-2 and move it 'over' dog-1 (see attachment-2)
Now i was planning to use select and intersect with model, remove everything i don't need and then unfold the drawing i would see in front and in the back of the dog, but by intersecting SU is not moving anymore.
There is probably an easier way of doing this (trying to get the 2 'green' parts like mentioned earlier) but how?
Ofcourse i will keep thinking about this one, but tips are welcome