Forums > MaxMSP
Forums > MaxMSP
Detecting a fast numerical increase or drop
Aug 07 2013 | 9:50 am
I have incoming numbers of 0 – 127, how would I want to do something like this: if $i1 decreases by 30 in 10ms then bang.
I’m trying to create sword effects triggered by wiimote movements and I want the "clang" sample to be triggered if a sudden decrease in accelerometer data is detected.
Any ideas?
Thanks in advance, you guys have been great in the few days since I got my Max license. Hopefully I’ll have learnt enough to be able to help out others before too long.
Aug 07 2013 | 10:42 am
Not to self promote, but I’ve made a video tutorial on doing basically exactly what you’re describing. You can cheggiddout here:
http://www.youtube.com/watch?v=trTeXfmD1ao
That being said, if you’re looking for something you can copy-paste, something like this might get you started:
<code>-- Pasted Max Patch, click to expand. --Copy all of the following text. Then, in Max, select New From Clipboard.----------begin_max5_patcher---------- 571.3ocyVssiaBCD8Y3qvxOSVgsABT0GZ+NppVYBt65UDSjwjl1U6+dw1gMa ZyEGKpUdAzLLd7YNbFO903HXc2NVOD7Iv2.QQuFGEYbocDs2NBtltaUKs2DF rdPo5DvD6m5FTsLk5WaX1b.qohmffuu+y7FyZ5peYApbZMhg0bw3pL4Cs24F pZ0ybwSOJYqT1bUk9PZBHCUneUTM878jOlG61aSj14aww5GINVKB1OGg1DtT rclcF1yZAnKWgI.3gp7GcBUO+2l.vYi37eK9hSV73qU7jkDSYiLFjOT758TP Wa1S3WkbZK7jzBd9nkOCVPROKsvEpahQx8jQvVgPg2LxLJTT.NfeQFI41IlL +5SvjRa6x8fTYwrISH9ISvkDqZ4g7PJSFVWyjWSPb7QjNvAX+TDnJSSRdp+J h22B4XzJl7QlfV2ZVW57oVFSsrCfRAegtRw2xt1gu2B2k5m9ozbJCFUcObLC et5lp7iLPYV1HGGV13+R2zMeMDBlbPQTUd2zL02xat.8bxKgU3YwmszpCLF3 km+RXNVilkCa4h+9tmFHn8ebg22MHWMUYSyE.GPQCqWwETEe7loeHn7iB5Yd SCy78IYQCuWitly+KvY7j6BdJBGdJbAOkgCOYtfG8OUT3vCxE7DH9A6B+jEL 7T4BbvgidRc.OUACNkNhlvnkcoU22Nc6A0zMa1xj86SoAHiyhdoSpMKRLlbg 0zLB.JYa4SwSLdnxwYKpwAKCR6nxckEvX897V7e.ZEOxlA -----------end_max5_patcher-----------</code>
Aug 07 2013 | 10:49 am
One way to detect a large drop between successive input values. Edit: posted this before seeing Sam’s response. Different approach to timing but otherwise similar…
<code>-- Pasted Max Patch, click to expand. --Copy all of the following text. Then, in Max, select New From Clipboard.----------begin_max5_patcher---------- 646.3ocyWtsabBCDF9Z3o.w0ahvXfEh5M84npJhCSINALHiIcahRe1K1rtkt wD4P.TtwZ8f2wey+bfce11xMq4Dz45biy2brrd11xRZRXv57dK25zS4Uocxi 4l2TWCTt6gwmwgSbocNiTVBLkcRgzZS18W4iUF+QCkSSqA4i9JijVodBsuto mWAb4k3oNOqLSt+ZkkVFzMb6obRC8VFjyGQGEGdc3Amf3jgSJOtXw46St2Nx Sx6EMwYo776HzxINJNR3GbhzOgHwJJdhmF3jPUXhD1dw1VrbvP4Kqmyan5TI e8ZA5r0QS7e0Bij5lkRKc+KXZhkv.A9miEeO055EKT3mCj+5JglRnnDzEin2 akf+aF8GtTELOQeTlawQwxTrm25mogmJRy+sNUv6sq5mk1fHYpLHTspGV+0K UlWQxePWLfN9dyjyVG2QJoCeoEmCCvAaVNbtgcDZaOWmrDtdi5LWGRjC+PIn sZn0fCxzNZGErZMzDgLu79Y7X+73XNbzqzf1T1.cbfcKPSypfoZ+VMHrqEfh JRsSnNoCuZcPKu2wGiMp2YEGo7Emqvd5zCuUSODkRK+UB338VRx5ye.3N9ZT kjUq+Rzb8AJThPa1P1YTkqzHGG+bTi3mf1rZjtJRg1Ys3EOUX13.kn3W7YuO 53R421shPu7eTHAPX++i6tldVtB2yoWm+wPAzwIT4O0exYDyIlbn6HEE.cJd EjNAwRgySaBvTbt3pzyi32ztW7fMfmjcCmKh7YjG+OW7fNteoKSJm82uxYi5 tB1MbLoX9hJ9sDmDCv43tRCx.ZPKflwwzossOBrtytTBxvKhtugI1FcPtkPG 2J8nKCdjnNersvauX+G.FmPJA. -----------end_max5_patcher-----------</code>
Aug 07 2013 | 1:37 pm
Thanks both.
Sam – is there any reason why the patch you describe in your video wouldn’t work using the ctlin object rather than udp?
This is what I have at the moment and it doesn’t seem to be working. The number object displays incoming MIDI numbers so osculator is working fine.
Edit: I’ve decided to just go with the UDP method as it seems to be working well. I am curious as to why my patch wasn’t working though…
— Pasted Max Patch, click to expand. —
Copy all of the following text. Then, in Max, select New From Clipboard.
----------begin_max5_patcher----------
{
"boxes" : [ {
"box" : {
"maxclass" : "comment",
"text" : "raw accel data \nx y z",
"linecount" : 2,
"frgb" : 0.0,
"numoutlets" : 0,
"fontname" : "Arial",
"patching_rect" : [ 212.0, 98.0, 210.5, 33.0 ],
"id" : "obj-43",
"fontsize" : 12.0,
"numinlets" : 1
}
}
, {
"box" : {
"maxclass" : "newobj",
"text" : "ctlin a1 2",
"numoutlets" : 2,
"fontname" : "Arial",
"patching_rect" : [ 286.0, 132.0, 59.0, 20.0 ],
"id" : "obj-37",
"fontsize" : 12.0,
"outlettype" : [ "int", "int" ],
"numinlets" : 1
}
}
, {
"box" : {
"maxclass" : "newobj",
"text" : "ctlin a1 1",
"numoutlets" : 2,
"fontname" : "Arial",
"patching_rect" : [ 212.0, 132.0, 59.0, 20.0 ],
"id" : "obj-33",
"fontsize" : 12.0,
"outlettype" : [ "int", "int" ],
"numinlets" : 1
}
}
, {
"box" : {
"maxclass" : "button",
"numoutlets" : 1,
"patching_rect" : [ 407.5, 377.0, 20.0, 20.0 ],
"id" : "obj-5",
"outlettype" : [ "bang" ],
"numinlets" : 1
}
}
, {
"box" : {
"maxclass" : "flonum",
"numoutlets" : 2,
"fontname" : "Arial",
"patching_rect" : [ 520.0, 184.0, 50.0, 20.0 ],
"id" : "obj-1",
"parameter_enable" : 0,
"fontsize" : 12.0,
"outlettype" : [ "float", "bang" ],
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}
}
, {
"box" : {
"maxclass" : "newobj",
"text" : "togedge",
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"fontname" : "Arial",
"patching_rect" : [ 407.5, 325.5, 54.0, 20.0 ],
"id" : "obj-48",
"fontsize" : 12.0,
"outlettype" : [ "bang", "bang" ],
"numinlets" : 1
}
}
, {
"box" : {
"maxclass" : "newobj",
"text" : "> 69.",
"numoutlets" : 1,
"fontname" : "Arial",
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"id" : "obj-46",
"fontsize" : 12.0,
"outlettype" : [ "int" ],
"numinlets" : 2
}
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, {
"box" : {
"maxclass" : "newobj",
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"fontname" : "Arial",
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"id" : "obj-45",
"fontsize" : 12.0,
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}
, {
"box" : {
"maxclass" : "newobj",
"text" : "t f f",
"numoutlets" : 2,
"fontname" : "Arial",
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"id" : "obj-44",
"fontsize" : 12.0,
"outlettype" : [ "float", "float" ],
"numinlets" : 1
}
}
, {
"box" : {
"maxclass" : "newobj",
"text" : "ctlin a1 3",
"numoutlets" : 2,
"fontname" : "Arial",
"patching_rect" : [ 361.5, 132.0, 59.0, 20.0 ],
"id" : "obj-40",
"fontsize" : 12.0,
"outlettype" : [ "int", "int" ],
"numinlets" : 1
}
}
],
"lines" : [ {
"patchline" : {
"source" : [ "obj-44", 1 ],
"destination" : [ "obj-45", 0 ],
"hidden" : 0,
"disabled" : 0
}
}
, {
"patchline" : {
"source" : [ "obj-44", 0 ],
"destination" : [ "obj-45", 1 ],
"hidden" : 0,
"disabled" : 0
}
}
, {
"patchline" : {
"source" : [ "obj-48", 0 ],
"destination" : [ "obj-5", 0 ],
"hidden" : 0,
"disabled" : 0
}
}
, {
"patchline" : {
"source" : [ "obj-40", 0 ],
"destination" : [ "obj-1", 0 ],
"hidden" : 0,
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}
}
, {
"patchline" : {
"source" : [ "obj-40", 0 ],
"destination" : [ "obj-44", 0 ],
"hidden" : 0,
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}
}
, {
"patchline" : {
"source" : [ "obj-46", 0 ],
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}
}
, {
"patchline" : {
"source" : [ "obj-45", 0 ],
"destination" : [ "obj-46", 0 ],
"hidden" : 0,
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}
}
],
"appversion" : {
"major" : 6,
"minor" : 1,
"revision" : 3,
"architecture" : "x86"
}
}
-----------end_max5_patcher-----------
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Forums > MaxMSP