tiled texture mapping
in [Matlab]
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From: Ross Anderson on 26 Mar 2010 18:24 I have a 128x128 tile-able image that I'd like to tile over a rectangular object defined by 'bounds'. I figured out that if I just want one image, I can say texture = imread('texture128x128.jpg'); npoints = 128; [XX YY] = meshgrid(linspace(bounds(1),bounds(2),npoints),linspace(bounds(3),bounds(4),npoints)); ZZ = zeros(size(XX)); surf(XX,YY,ZZ,texture,'FaceColor','texturemap','EdgeColor','none'); But what if I want to tile my image? (it would look better that way, and less pixelated). Also, say my shape isn't a rectangle. How would I use a square image as a texture for an arbitrary shape?
From: us on 26 Mar 2010 19:05 "Ross Anderson" <rpa5nospam(a)cornell.edu> wrote in message <hojc63$bc1$1(a)fred.mathworks.com>... > I have a 128x128 tile-able image that I'd like to tile over a rectangular object defined by 'bounds'. I figured out that if I just want one image, I can say > > texture = imread('texture128x128.jpg'); > npoints = 128; > [XX YY] = meshgrid(linspace(bounds(1),bounds(2),npoints),linspace(bounds(3),bounds(4),npoints)); > ZZ = zeros(size(XX)); > surf(XX,YY,ZZ,texture,'FaceColor','texturemap','EdgeColor','none'); > > But what if I want to tile my image? (it would look better that way, and less pixelated). > Also, say my shape isn't a rectangle. How would I use a square image as a texture for an arbitrary shape? one of the solutions img=load('clown'); img=img.X; [x,y,z]=peaks(64); surf(x,y,z,img,'facecolor','texturemap','edgecolor','none'); disp('press any key to tile...'); pause; img=[img,ceil(100*rand(size(img)));ceil(100*rand(size(img))),img]; surf(x,y,z,img,'facecolor','texturemap','edgecolor','none'); us
From: ImageAnalyst on 26 Mar 2010 19:14 Ross Anderson: Sounds like you'd be interested in image quilting: http://graphics.cs.cmu.edu/people/efros/research/quilting.html I do have MATLAB code for it, I might be able to share it if you're interested.
From: Ross Anderson on 26 Mar 2010 19:36 ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <096a9eb8-24d6-4ae1-8223-a08cd3bbc7ee(a)o30g2000yqb.googlegroups.com>... > Ross Anderson: > Sounds like you'd be interested in image quilting: > > http://graphics.cs.cmu.edu/people/efros/research/quilting.html > > I do have MATLAB code for it, I might be able to share it if you're > interested. Hmm. Looks like that does quite a bit of image processing, but I think it's too complex for my needs. My image is tile-able and square, so if I had a diagonal rectangle polygon to fit, I could lay a bunch of tiles in a square grid that covers the entire polygon, then crop out those that extend beyond the polygon. But I don't know how to do this yet for a surf defined by a grid of a certain size. I'll try and play around with the clown code.
From: Ross Anderson on 26 Mar 2010 20:00
So looking into what you both have said, I think I can place a nicely tiled image over a solid shape. But what if I want to surf a collection of shapes with one tiled image? I'm running into a problem. A good example to demonstrate what I'm going for is a hollow triangle. I can create three sides based on rectangles with semicircles on the ends, then individually surf them, but the tiling doesn't match up at the vertices. If I combine the three collections of points then surf that, I get a filled in triangle, but the tiling works. How can I achieve both? |