GT6ixer

I agree with this approach as it is the most straightforward. Keep in mind that the "blocks" are not true rectangles. As is shown in Andrew's headrest photo above, the narrow edge of the rectangles are serrated and the number of serrations vary with the width of the block. I count 9 serrations on the widest blocks and 4 on the narrowest.

Jerry Feather

Oh. Except the pattern shown is 22 widths if you count the half widths at each end as one.

The new pattern will be 16, again counting the half widths at each end as one.

Jerry Feather

I see that there is a way to adjust the width of each of the segments so that the cluster of larger squares look much more circular. I don't think I'll go there, however.

Or, maybe not.

Jerry Feather

I think that the serrations are a function of the weave and not the pattern. In the pattern all the lines are straight and parallel and/or perpendicular, so they are true rectangles.

GT6ixer

You may be right. I am far from an expert on textiles, but you'd think if they wanted to make a pattern without the serrations they could have. And doesn't the weave go both in the horizontal a vertical directions? If so, then why are there not serrations on the long side of the rectangles?

GlenL

I see you've made your pattern starting in the middle of the smallest square. Others (like me and maybe Dr. Bob) would start at a corner and go to the same corner across the full cycle. The definition isn't centered on the symmetry but it's simpler to make.

Are there three bands in the small section that are the same width?

Jerry Feather

Nate, I think the did the weaving with plain thread in one direction and serration thread the other. I think that is how they make corduroy cloth so that the ribs go in only one direction.

Jerry Feather

I guess I don't understand this. I actually worked up the spacing of the lines working numerous times from each end of the scale in order to get the spacing kind of evenly progressive and still fit the length needed.

Jerry Feather

Here is what one section of the new pattern looks like mostly by itself and in the horizontal orientation. Half of the outer edges will be common with the adjoining segments of the same pattern, so repeat is in the middle of the outer rows of blocks.

I'll ink in some more of it to show the basic pattern as I see it with the 45 degree orientation.

dr bob

Jerry --

I'm stuck working on a little turbine process model for the next day or so. I'll get some numbers loaded for the Pascha and an image file up to look at sometime early next week.

The Pascha model uses dynamic blocks with dimensions from a parameter file. The "repeat" is defined now at 20 columns/20 rows, same as the image of the fabric rolled out on the hood. Q: Is there a reason you choose not to use that repeat number in yours? (appears to be 18...)

Jerry Feather

Doc, the pattern on the hood has 19 horizontal rows and 20 vertical rows. The pattern repeats on lines from the centers of the four groups of the four largest squares. The pattern is not symmetrical. There is a very small white or light colored square in about the center of the pattern and then 10 rows left of it, 9 rows right of in, then 9 rows each above and below it. The widths of the rows are not progressive and that causes some visual flaws in it. I don't know if the pattern is square or not.

My design is intended to meet a specific upholstery application and in order for the separate cushion sections to have the pattern centered on each one the pattern has to meet my measurement. Starting with that and some general desire about the size of the various blocks has given rise to the progression I designed and results in 18 rows each way with the outer of those being only half rows for pattern repeat.

I don't think the Porsche factory designed the pattern, but if they did they did it poorly. I don't think it was designed to fit any particular application, but rather was simply found somewhere and adapted.

Jerry Feather

Now here is the new pattern in the 45 degree orientation and including one repeatable pattern at least out to the middle of the outer rows of what are now diamonds. I think it is going to do just what I need for it to do.

It will be interesting to see if Dr Bob can come up with the same pattern in a form that might be much more usable for someone to print this pattern on leather.

Jerry Feather

I am also finding it interesting and desirable that the "secondary" appearance of the grouping of larger blocks has now taken on a more circular appearance than in the earlier version where they are a little more squarish. I had mentioned that that might be accomplished with some adjustment in the progression of the band widths, but here it is purely by accident.

Jerry Feather

I have most of it colored in and it is looking like I think it ought to look.

GlenL

I had to look at the pattern again and more closely. Now I see what you're describing. The lack of perfect symmetry and subtle pattern variations must be what makes it so eye catching. It seems to move on its own, especially in larger section.