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Evan
03-25-2011, 02:55 PM
I always need something to do in the middle of the night when I can't sleep so I frequently work on 3D models in Sketchup just for fun.

Here are a few:

This is a roll off roof observatory for the new scope. It's what I would like to build but it isn't going to happen this year. I have too many projects outside that were shut down by the heavy smoke last year.

http://ixian.ca/pics8/observatory.jpg

This is a purely imaginary research/diving/ROV/coastal vessel. Since cost is no object it's 85 feet long with a displacement of around 60 tonnes. This is a WIP (Work In Progress) so there are many details missing such as hatches, anchors, interiors and bulkheads etc. The models contains detail down to the level of screw heads.

http://ixian.ca/pics8/mvimaginary.jpg

This is a coilgun/railgun that can launch a car sized projectile at 2 kilometres per second. It is designed using the SketchyPhysics 3.2 software and actually uses the magnetics simulation to launch the projectile. All the "coils" are active in the simulation instead of just cheating and giving the projectile a programmed velocity vector.

You can check it out on the Google 3D warehouse at

http://sketchup.google.com/3dwarehouse/details?mid=d75dc7b5f84e394be845c056d1647575&ct=mdsa

It requires SketchUp 7 or 8 and only works with the latest version of SketchyPhysics 3.2

http://ixian.ca/pics8/SP_railgun.jpg

It also contains (unpublished) a working helicopter that can be flown.

http://ixian.ca/pics8/heli.jpg

None of these models contain any components from other peoples work.

aostling
03-25-2011, 03:06 PM
Very impressive models.

I'm wondering how you defined the hull shapes of the catamaran. If I could do that I might take up model shipbuilding myself.

Evan
03-25-2011, 04:07 PM
It is impossible to explain so I will have to do a step by step tutorial. It isn't as difficult as it may look even though this hull is pretty complex. I still haven't installed the propulsion.

http://ixian.ca/pics8/hull.jpg

The cool thing is that I can actually test the stability and balance in SketchyPhysics. I haven't done that yet as I still have a lot of items to add. You can place items and specify a density for the volume which is then used to calculate the weight and balance when it is floating.

madwilliamflint
03-25-2011, 04:20 PM
You sick little monkey! That's a bunch of ridiculousness right there.


Now.


About that railgun...


You have a parts manifest yet?

:p

OwenG
03-25-2011, 04:56 PM
Great work, Evan. I'm still in the very basic learning curve of Sketch up.

aostling
03-25-2011, 11:13 PM
It is impossible to explain so I will have to do a step by step tutorial. It isn't as difficult as it may look even though this hull is pretty complex.

I'm wondering if you can model hull shapes to scale, from measured drawings. I'd like to eventually be able to go from a table of offsets, shown here:


http://i168.photobucket.com/albums/u183/aostling/plans.jpg

... to a perspective view of the hull, as in this example from Howard Chapelle's American Small Sailing Craft:


http://i168.photobucket.com/albums/u183/aostling/sneakbox-1.jpg

This strikes me as a pretty tall order for SketchUp, but perhaps not impossible.

Ken_Shea
03-26-2011, 12:04 AM
Evan,
You are really good at that, also takes more then some sketchup skill, skill can be learned, imagination.... well, that's another thing, unfortunately, a trait I seem to be lacking in.

boslab
03-26-2011, 12:27 AM
liked the observatory, i remember speaking to Patric moore after a lecture he gave at a local lecture hall, he was signing the books me and my son had purchased when i asked about his observatory at home, that was it, he was off on a good old rant about his neighbours giant beech[i think] trees beeing in the way of a big bit of sky and the damn things had even stood up to a hurricane, i definately got the impression he was not a tree hugger.
Anyway not being up on the subject i always thought observatories benifited from some rotational capacity, how would you manage [i think i'm just kinkey about great big domes like Palomar!
mark

Evan
03-26-2011, 01:12 AM
My northern sky isn't worth looking at as there is some sky glow from the nearby town. I also have a very high horizon to the east so that leaves only the south to the west up to the zenith as usable observing directions. There is also a very important benefit to the roll off roof design. If it has a lot of snow and ice on it that just rolls along with it. Domes always leak and you have to clean them off to be able to open the port.

As for modeling to a table of offsets, that is certainly possible although it will be tedious. I am looking for a macro recorder that works as a plugin for Sketchup. That way it will be compatible with Windows or Mac.

I'm going to try and explain how the hull was modeled. I'll see if I can find a table of offsets for a canoe design to play with.

tmc_31
03-26-2011, 01:20 AM
Nice job Evan, I have used Sketch-up a couple of times to model porches and backyard decks that I have built for customers. It is a pleasure to use.

Tim

PeteF
03-26-2011, 03:38 PM
Nice job Evan, I have used Sketch-up a couple of times to model porches and backyard decks that I have built for customers. It is a pleasure to use.

Tim

Tim, I'm curious as to whether you (or others) have used the function I've seen in Sketchup to incorporate modelling into an existing photo? I have a porch I need to change and have a few ideas but I'm not really sure how they'll look on this particular house in reality. I'd like to take a photo and model the porch on to is. There's an existing porch but it looks crap, so it's a matter of changing it to something that looks better yet is still in keeping with the rest of the house and uses the existing porch structure as much as possible. Beyond my weeny imagination, so time to crank up some VR :D

Pete

justanengineer
03-26-2011, 05:10 PM
Nice to see someone else enjoys solid modeling the way I do. Outstanding work Evan, but I cant help but wonder if youre ever going to upgrade to a program that has some real functionality? Drawing those hulls in the manner aostling described would be a breeze in several of the programs I use.

Evan
03-26-2011, 06:09 PM
Drawing those hulls in the manner aostling described would be a breeze in several of the programs I use.


It is really easy in SketchUp too. SketchUp has a great deal of almost hidden functionality that isn't documented. In fact, that is by far the biggest weakness of the program. It doesn't have any real documentation.

I simply cannot justify spending a lot of money for something that amounts to entertainment.

flathead4
03-26-2011, 09:29 PM
I simply cannot justify spending a lot of money for something that amounts to entertainment.

If everyone thought that way the GDP of the US would probably drop by 30%.:)

Those are some nice Sketchup drawings.

Evan
03-29-2011, 09:23 PM
I was doodling around trying to figure out the best way to make a tutorial on curved surfaces and then I became sidetracked.

This is what happened instead. BTW, everything in the image is my work.

http://ixian.ca/pics8/space_plane2.jpg

http://ixian.ca/pics8/space_plane3.jpg

Dan Dubeau
03-29-2011, 10:42 PM
I was doodling around trying to figure out the best way to make a tutorial on curved surfaces and then I became sidetracked.

This is what happened instead. BTW, everything in the image is my work.

http://ixian.ca/pics8/space_plane2.jpg

http://ixian.ca/pics8/space_plane3.jpg

You created the universe? :D

Nice work. I can appreciate the amount of time that one can put into a seemingly simple model. Unfortunately I don't have the patience to do it unless someone is paying me for it. Fortunately someone does.

I never did catch on to sketchup though. Only tried it for a couple hours a few years ago, so I probably never really gave it a good chance and It's probably come a long way since then. I do have mechanical desktop and rhino to model in, and edgecam for programming, but this sketchy physics you mention might have me take a second look. sounds interesting to play around with. does sketchup import Iges, or step?(or any other formats?)

aostling
03-30-2011, 12:09 AM
Evan,

You have outdone yourself with this rendering. Everything about it is amazing -- the stars, the atmospheric haze, and the spacecraft itself.

Those are hypersonic engine inlets, I assume.

Evan
03-30-2011, 12:27 AM
With the appropriate free plugins the free version of SketchUp can import/export dxf, 3ds, dae, stl, obj, collada and a few others. Combine that with with various format convertors such as Wilbur and you can import and export to just about anything.

Sketchup can do height fields so terrain data can be used in SketchUp.

Evan
03-30-2011, 12:38 AM
Allan,

Those engines are modelled after the SR-71 J-58 turbo ramjet engines. They can run at up to Mach 4 and probably faster. With oxygen injection they will work at over 100,000 feet. What can't be easily seen in the model is that in the centre is an aerospike engine that takes over when the ramjets quit. Most of the fuesalge is fuel tank. This is pretty close to the current ideas for a single stage to orbit spacecraft. By using turbo-ramjets it would have the capability to fly itself from a runway and do a much more efficient climb to altitude where the pure rocket can take over. As a not so minor benefit it would also be able to manoeuvre on the ground.

BTW, that isn't a rendering. It is a direct screen capture from Sketchup.