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Recently I was pointed to Google's SketchUp for doing 3D visual modeling. It is free for personal use. I've been playing with it for 2 days. It is very intuitive and has a simple interface that makes it relatively easy to experiment. It allows for parts. The window in the third image is a part which is included in the first and second images. The red box, which represents a jerry can, is also a separate part. Even the completed truck is a part. They are all just models and treated the same. You can include a model into another model and it acts as a single entity unless you "explode" it.
I've just been using basic SketchUp. They have extensions others have provided. Some time I'll look through them.
The stuff below is some work I've been experimenting with while trying to further the design for a Micro RV on the back of a Toyota '94 4x4 Pickup.
First, the green pickup is a model I grabbed from menu "File>>>3D Warehouse>>>Get Models..." with the search "Toyota pickup". I then exploded it a few times and removed the pickup bed and replaced it with my own back.
Here is the bottom interior of the bed cut off at just above the cab top. The walls would be 1" to 2" thick and insulated so interior dimensions are a bit off. I'm using this model for design verification. Will what I want to do work? is what I'm trying to answer with it. I've already verified that I can fit 2 jerry cans on each side in compartments between the cab and wheel wells. I have to access them through a door that is narrow, but it works. You put the forward one in first and slide it forward. Then you put the rear one in. The red object is a jerry can sized box. I found a "jerry can" model via the search, but it was 8" wide, as well as a bit to tall and wide. So I made a quick and dirty jerry can based on the largest jerry can I know of which is Scepter's water can. It is actually a bit wider than their fuel jerry cans.
#1:
Here is it with the top on. I should put the solar panels on to make it more interesting.
#2:
On the side wall of the RV back is a test window. It is much like a standard RV window and was a real ***** to figure out how to make. I finally figured out that if I made a perimeter of the right shape I could have SketchUp extrude a shape along that perimeter. So I made two mating extrusion shapes then extruded them around the desired perimeter. It roughly mimics what I remember about the shape of a 1600 series double paned RV window from Peninsula Glass. My sizes and thicknesses may be a bit off, but it is close enough for proto work. It also needs the glass split into two panes for sliders and screens added.
#3:
Finally here is a slightly different view with the cut plane, they call them "Section Planes" and "Section Cuts", active and from the side. The "Section Plane" is in blue and where it intersects the model it cuts off view of what is in front of it when it is active. You can hide them yet still have it active like I have in image #1 above.
#4:
If you decide to play with SketchUp I recommend playing the first few introductory tutorial videos. They have a whole library of video tutorials. I watched the first couple, then have been using their online help for learning.
Links to images off my website if your blocked from seeing imageshack.us.
#1: Micro-RV-test-model-01-006.jpg
#2: Micro-RV-test-model-01-006-all.jpg
#3: RV-Window.jpg
#4: Micro-RV-test-model-01-006-side-cut.jpg
I've just been using basic SketchUp. They have extensions others have provided. Some time I'll look through them.
The stuff below is some work I've been experimenting with while trying to further the design for a Micro RV on the back of a Toyota '94 4x4 Pickup.
First, the green pickup is a model I grabbed from menu "File>>>3D Warehouse>>>Get Models..." with the search "Toyota pickup". I then exploded it a few times and removed the pickup bed and replaced it with my own back.
Here is the bottom interior of the bed cut off at just above the cab top. The walls would be 1" to 2" thick and insulated so interior dimensions are a bit off. I'm using this model for design verification. Will what I want to do work? is what I'm trying to answer with it. I've already verified that I can fit 2 jerry cans on each side in compartments between the cab and wheel wells. I have to access them through a door that is narrow, but it works. You put the forward one in first and slide it forward. Then you put the rear one in. The red object is a jerry can sized box. I found a "jerry can" model via the search, but it was 8" wide, as well as a bit to tall and wide. So I made a quick and dirty jerry can based on the largest jerry can I know of which is Scepter's water can. It is actually a bit wider than their fuel jerry cans.
#1:

Here is it with the top on. I should put the solar panels on to make it more interesting.
#2:

On the side wall of the RV back is a test window. It is much like a standard RV window and was a real ***** to figure out how to make. I finally figured out that if I made a perimeter of the right shape I could have SketchUp extrude a shape along that perimeter. So I made two mating extrusion shapes then extruded them around the desired perimeter. It roughly mimics what I remember about the shape of a 1600 series double paned RV window from Peninsula Glass. My sizes and thicknesses may be a bit off, but it is close enough for proto work. It also needs the glass split into two panes for sliders and screens added.
#3:

Finally here is a slightly different view with the cut plane, they call them "Section Planes" and "Section Cuts", active and from the side. The "Section Plane" is in blue and where it intersects the model it cuts off view of what is in front of it when it is active. You can hide them yet still have it active like I have in image #1 above.
#4:

If you decide to play with SketchUp I recommend playing the first few introductory tutorial videos. They have a whole library of video tutorials. I watched the first couple, then have been using their online help for learning.
Links to images off my website if your blocked from seeing imageshack.us.
#1: Micro-RV-test-model-01-006.jpg
#2: Micro-RV-test-model-01-006-all.jpg
#3: RV-Window.jpg
#4: Micro-RV-test-model-01-006-side-cut.jpg