Tessellating Scales Design

I finally bought some food-grade pourable silicone for some of my projects. In the next few weeks I'll hopefully be milling, prepping, and pouring my designs.

Below is a tessellating scales design I put together. It will become a mold for making chocolate bars. The scales can be individually filled with colored candy melts and then the chocolate will be poured to fill the rest of the mold and create the bar. To streamline the multi-color candy melt pour, I think I will use these silicone squeeze tubes, keeping them warm in a warm water bath.

The design is available here as a pdf.

Desk

Not too much to post recently, so here's my desk. This is the second desk I've built this year. It isn't anything fancy, but it is fairly sturdy and quite practical. I tried to keep the total cost down so I built it with 2x4s and OSB which are fairly cheap materials. I finished the top layer with some Polycrylic.

T-shirt

I finally finished a sewing project, and it didn't turn out completely lopsided or otherwise messed up! As my first few sewing projects have been humbling experiences, I've scaled back my immediate sewing goals quite a bit. The result is pictured below. It is a t-shirt for my boyfriend. I had (and still have most of) an old bed set made of a jersey 50/50 cotton/polyester blend. I used a pillowcase from the set for the front and back pieces of the shirt. The pattern was just eyeballed and loosely marked with tape based on a t-shirt from his wardrobe. I did a simple kind of hem style, and made it 'inside-out' to add some visual flair (after I sewed it, I carefully clipped the edge of the fabric to give it a clean, even look). Tomorrow I'm taking the machine apart again to do the reverse-engineering project I described in the previous post. We'll see how that goes...I'm feeling a little hopeful.

Sewing and Sewing Machines

While cleaning the apartment I was reminded of my collection of fabrics and scraps that were just sitting in the closet gathering dust. So I decided to revisit sewing.

I find sewing to be a uniquely frustrating hobby. This time around, I spent hours on a hand-drafted, perfectly functional t-shirt. From a technical perspective I should have been pleased--the garment was the right size, it was symmetric, and the stitching was neat enough. But unfortunately the aesthetic was...very ugly. The fabric was a heavyweight stretchy khaki colored cotton blend from an old xxl men's polo shirt, which sported a small bleach stain. The goal was to reuse it to make a large sized men's t-shirt. Somehow I managed to make it into a large sized women's t-shirt though, with a tapered waist and boat neck...a very large, weighty, khaki colored, women's t-shirt with a bleach stained, sized for my boyfriend. I threw it away and then threw a small tantrum. Sewing just...it has that effect on me. I hate it.

But hating even more the idea of being bested by this infernal craft, or perhaps just a glutton for punishment, I decided to revisit the men's t-shirt idea again this morning, this time using a more traditional fabric choice (gray thin jersey knit cotton blend from an old full-sized bedsheet set). Everything looked right, since I wasn't cutting any corners, well except maybe one corner was cut...The use of cheap thread.

Sometime in the past I acquired a lot of cheap thread that pills up and snags easily. But it was the closest color to the project fabric and I wanted to use it and get rid of it (not being one to waste). Unsurprisingly the thing snagged in the mechanism, causing the machine to stall and then default into error mode (nice feature on digital machines by the way, to prevent them from ripping themselves apart). The end result of this was to break the automatic needle threader though.

This was as good an excuse as any, I figured, to open the machine up and clean it and learn about it and revisit my project idea to try and interface with it so that I can upload custom stitches to it via USB...the good news is that the motherboard seems to sport a 4 pin serial pinout! So now the t-shirt sits forgotten, pins in place along the seams, while the machine sits in two parts on the table so that I can poke at it with a multimeter and try to get a USB-to-serial interface between it and my computer.

Katniss the cat of course had to inspect the work in progress.

Building A Custom Blender Build (and failing)

I decided to compile my own build of Blender on Windows. The main reason is that the sewing addon I want is a patch, not a script, so I have to apply to to the Blender source code and then compile. I'm typically a Unix user (and most often I'm specifically a Darwin user), so when it comes to using the Windows command prompt, or knowing where certain important system files are, or anything a power user might need, I get a bit lost.

I have not yet produced a successful build. To illustrate a point about how difficult these things usually end up being, here are some of the issues I've run into so far:

• I had no previous setup for Windows so I had to choose what tools to install, namely: a git or svn client, a compiler, a build system
• I installed mingw64 in a directory with spaces in the pathname which is a no-no
• I needed to add some directories to my Windows PATH variable
• I retrieved precompiled libs for Windows but put them in the wrong place initially
• I was not sure what command to actually use to install using the cmake-generated Makefile (mingw32-make, which confused me because I'm installing 64-bit blender with mingw64)
• The compiler failed because of libmv, so I just decided to disable that in the build, as I don't need that feature in Blender
• The process failed due to complaints about the openimageio library...and I had no clue how to proceed, so I decide to switch to using SCons instead of CMake, since somebody mentioned that the daily Blender builds are done with SCons and minGW
• SCons installer can't find Python in the registry...I find out I need 32-bit Python, and I installed 64-bit Python
• SCons errors out early, and I learn I need to set a flag BF_TOOLSET=mingw, which I just pass in the command line because SCons doesn't see my user-config.py file for some reason...
• After a long time, build errors out. More online searches suggest the problem may be due to the fact that I am using gcc 4.8 and I need to get 4.6 instead...
• Now the build fails compiling files to do with Cycles when using SCons...
• Now the build fails at the linking stage when compiling with CMake-gui...

The bullet points seem to fly by quickly...but keep in mind that each, on average, required significant time in google searches, trial and error, and CPU time to actually diagnose and get past.

The good news is of course the availability of builds on graphicall.org and of course you can always go to http://www.blender.org/download/. Still, I'm hoping I can get this figured out someday soon.

Exploring Materials in Blender

Up to now I was ignoring most of the options I had in the Diffuse settings section of the Materials settings panel (for Blender Internal). There are other ways to get the right 'lighting feel' for objects, including using the Node Editor, using light sources themselves, and using other aspects of the Materials panel, but I feel that this is a powerful one.

Here are two blends using just good old Suzanne. The experiments focus largely on distortion and painterly feel using the node editor, and colors manipulation using the Diffuse section of the Materials settings. Key aspects:

• The RenderLayers output are the monkey heads on a transparent background
• A noise texture is used to with a Displace node on the monkey heads to create a rough-edges paint feel
• A wood band texture is used with a Displace node to distort the monkey heads shapes in a psychedelic way
• The monkey heads are mixed with the paper texture via a Soft Light node and overlayed onto the paper with an Alpha Over node

The paper texture is from cgtextures.com.

Watercolor Test

I tried another watercolor blend using the node setup provided here. Once again, this is the cloth-on-a-stick object I created with the basics cloth physics capabilities in blender.

This blendersartists thread discusses this style and another setup in detail. I will explore this style in more detail later in order achieve some specific results I'd like to see.

Styles Comparison Test

I set up a scene and rendered it in four different styles. This should help people unfamiliar with 3D graphics techniques to really understand the power behind these tools.

The images above correspond with the following styles:

1. Plain
2. Freestyle and ink shader
3. Watercolor nodes
4. Cel shader

Attribution section:

• Lightbulbs by hunter1231
• Rope Knots by mStuff

Cloth and physics test

A quick test of the cloth simulation.

It occurred to me that having the clothing move with the rig for the character might be tricky. I figured it would be a lot simpler to have every clothed character start out in a basic 'Vitruvian Man' position, and then actually animate the body to get to the final pose. Enabling cloth physics, now the animated body will push the clothes into position.

The basic steps for this test:

• The mesh starts off as a flat circle with a hole in the center, evenly subdivided into quads.
• I place this flat circle mesh around the model waist and pin along the perimeter of the top opening.
• I do a first physics simulation to get the skirt to drape downwards, then apply it to the skirt mesh
• I animate the leg (single keyframe was sufficient)
• I run another physics simulation to have the leg push the skirt

Things are moving along...! I need to practice character rigging though, because I have a bunch of unrigged body meshes from blendswap that I would like to use.

Attribution section:

• Rigged Female Figure by AlexanderLee

Virtual Dressmaking Test #1

Here are some more interim results on virtual dressmaking. They are pretty ugly results, at least from a fashion perspective, but they illustrate the techniques I've been experimenting with so far.

There are still a lot of issues to iron out (yep, a pun). The yellow dress below was meant for someone less busty than the model I put it on. I like the way the physics worked on the hem though.

All the jewelry here are just simple torus meshes run with the cloth physics and high stiffness and damping parameters. The bracelets are like very thick rubber. The necklace stretches itself out and then lays flat on the blouse. I did try to use some of the other physics simulator options (rigid body, soft body) but I couldn't get the parameters right and the meshes were not behaving the way I wanted. Whatever works though...

Attribution section:

• Rigged Female Figure by AlexanderLee.