http://www.k-wave.org/forum/topic/how-to-generate-a-circle-in-3d-space Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 00:25:21 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/how-to-generate-a-circle-in-3d-space#post-6611 Mon, 29 Oct 2018 08:50:18 +0000 Alexll7 6611@http://www.k-wave.org/forum/ <p>Yes, it was just because you didn't initialize your cylinder as my_cylinder = zeros(Nx,Ny,Nz). No problem,<br /> Best regards,</p> <p>Alex </p> http://www.k-wave.org/forum/topic/how-to-generate-a-circle-in-3d-space#post-6609 Sat, 27 Oct 2018 13:38:35 +0000 zhangguangjie 6609@http://www.k-wave.org/forum/ <p>hello Alexandre<br /> I have solved the problem.<br /> thanks very much! </p> http://www.k-wave.org/forum/topic/how-to-generate-a-circle-in-3d-space#post-6608 Sat, 27 Oct 2018 10:27:48 +0000 zhangguangjie 6608@http://www.k-wave.org/forum/ <p>hello Alexandre,<br /> Thank you very much. by your help,I can get a cylinder source model. Now i meet a new problem.<br /> The code are as follows:<br /> Nx = 256;<br /> Ny = 256;<br /> Nz = 256;<br /> dx = 20e-6;<br /> dy = 20e-6;<br /> dz = 20e-6;<br /> kgrid = kWaveGrid(Nx, dx, Ny, dy, Nz, dz);<br /> medium.sound_speed = 1500;<br /> input_args = {'DataCast', 'single'};<br /> magnitude=20;<br /> for i=(127:130)<br /> my_cylinder(:,:,i) =magnitude* makeDisc(Nx, Ny, Nx/2, Ny/2, 20);<br /> end<br /> voxelPlot(my_cylinder)<br /> p0=my_cylinder;<br /> source.p0 = p0;<br /> sensor.mask = zeros(Nx, Ny, Nz);<br /> sensor.mask( Nx/2, Ny/2, 200) = 1;<br /> sensor_data_3D= kspaceFirstOrder3D(kgrid, medium, source, sensor,input_args{:});<br /> when I run the code,<br /> erroe use kspaceFirstOrder_inputChecking (line 749)<br /> source.p0 must be the same size as the computational grid.</p> <p> I can not find the reason for it.<br /> Thanks in advance </p> http://www.k-wave.org/forum/topic/how-to-generate-a-circle-in-3d-space#post-6607 Fri, 26 Oct 2018 10:11:16 +0000 Alexll7 6607@http://www.k-wave.org/forum/ <p>Hello zhangguangjie,</p> <p>For the cylinder, you can, for instance, just iterate makeCircle with a loop.<br /> I mean :<br /> for i=(1:Nz)<br /> my_cylinder(:,:,i) = makeCircle(..........);<br /> end<br /> (if the cylinder axis is one of the 3 main axis and, if it's not the case, you can just rotate the result after)<br /> For more complex structures, I'm sure that you can find a toolbox doing that. Did you search such a thing in the AddonExplorer? </p> <p>Best regards,</p> <p>Alexandre </p> http://www.k-wave.org/forum/topic/how-to-generate-a-circle-in-3d-space#post-6606 Thu, 25 Oct 2018 12:51:18 +0000 zhangguangjie 6606@http://www.k-wave.org/forum/ <p>Hello everyone<br /> how to generate a circle source in 3D Kgrid? i only see makeCircle(Nx, Ny, cx, cy, radius).what's more, how to generate more three source,such as cylinder?<br /> Thanks in advance! </p>