wterrain2
wterrain2 — A wave-terrain synthesis opcode using different curves
Description
A wave-terrain synthesis opcode that enhances the wterrain opcode by providing some more curves, krate table parameters and a parameter for rotating the curve.
Performance
ktabx, ktaby -- The two tables that define the terrain - they can be changed at krate.
The output is the result of traversing at frequency kcps the curve kcurve with the parameter kcurveparam (see below), scaled with krx and kry and centered at kx, ky on the terrain and rotated around the center with krot radians.
kcurve=0: ellipse as in the wterrain opcode but with a special extension. kcurveparam controls a speed change of the traversing point. The formula is:
fx(t) = kx + krx * sin( t + kcurveparam * sin(t) )
fy(t) = ky + kry * cos( t + kcurveparam * sin(t) )
kcurve=1: lemniskate - this is a simple 8. here also the kcurveparam controls a speed change of the traversing point. The formula is:
fx(t) = kx + krx * cos( t + kcurveparam * sin(t) )
fy(t) = ky + kry * sin( t + kcurveparam * sin(t) ) * cos( t + kcurveparam * sin(t) )
kcurve=2: limacon
fx(t) = kx + krx * sin(t) * (cos(t) + kcurveparam);
fy(t) = ky + kry * cos(t) * (cos(t) + kcurveparam);
kcurve=3: cornoid
fx(t) = kx + krx * cos(t) * cos(2*t)
fy(t) = ky + kry * sin(t) * (kcurveparam + cos(2*t))
kcurve=4: trisectrix (Ceva)
fx(t) = kx + krx * cos(t) * (1+kcurveparam*sin(2*t));
fy(t) = ky + kry * sin(t) * (1+kcurveparam*sin(2*t));
kcurve=5: scarabeus
fx(t) = kx + krx * cos(t) * (1+kcurveparam*sin(2*t));
fy(t) = ky + kry * sin(t) * (1+kcurveparam*sin(2*t));
kcurve=6: folium
fx(t) = kx + krx * cos(t) * cos(t) * (sin(t)*sin(t) - kcurveparam);
fy(t) = ky + kry * sin(t) * cos(t) * (sin(t)*sin(t) - kcurveparam);
kcurve=7: Talbot curve
fx(t) = kx + krx * cos(t) * (1 + kcurveparam * sin(t)*sin(t));
fy(t) = ky + kry * sin(t) * (1 - kcurveparam - kcurveparam*cos(t)*cos(t));
Examples
Here is an example of the wterrain2 opcode. It uses the file wterrain2.csd.
Example 1244. Example of the wterrain2 opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> -odac -d </CsOptions> <CsInstruments> sr = 48000 ksmps = 32 nchnls = 2 0dbfs = 1 gisine ftgen 0,0,2^12,10,1 gScurves[] fillarray "ELLIPSE ", "LEMNISKATE ", "LIMACON ","CORNOID ","TRISEXTIC ","SCARABEUS ","FOLIUM ","TALBOT " instr 1 prints gScurves[p4] kdclk init 0 kdclk linsegr 0, 0.1, 1, p3-0.02, 1, 0.9, 0 kparam init 0 krot init 0 krot linseg 0,p3,6.28 ; ROTATE THE CURVE SLOWLY kparam linseg 0,p3,4 ; INCREASE CURVEPARAMETER asigL wterrain2 0.5, 110, 0.5, 0.5, 0.8, 0.4, krot, gisine, gisine, p4, kparam ; LET THE POINT FOR RIGHT RUNNING BACKWARDS FOR A LITTLE STEREO EFFECT asigR wterrain2 0.5, -110, 0.5, 0.5, 0.8, 0.4, krot, gisine, gisine, p4, kparam asigR dcblock asigL asigL dcblock asigR asigL*=kdclk asigR*=kdclk aL,aR reverbsc asigL, asigR, 0.6, 15000, 44100, 0.5, 1 outs aL,aR endin </CsInstruments> <CsScore> i 1 0 40 0 ; ELLIPSE i 1 41 40 1; LEMNSIKATE i 1 82 40 2; LIMACON i 1 123 40 3; CORNOID i 1 164 40 4; TRISEXTIC i 1 205 40 5; SCARABEUS i 1 246 40 6; FOLIUM i 1 287 40 7; TALBOT e </CsScore> </CsoundSynthesizer>
Here is an other example of the wterrain2 - a sound fugue. It uses the file wterrain2_2.csd.
Example 1245. Another Example of the wterrain2 opcode - a sound fugue
<CsoundSynthesizer> <CsOptions> -odac -d </CsOptions> <CsInstruments> sr = 48000 ksmps = 32 nchnls = 2 0dbfs = 1 gisine ftgen 0,0,2^12,10,1 instr 1 kamp adsr 0.1,0.01,1,10 ; THE MODULATION PARAMETERS krot linseg 0,p3,6.28 ; ROTATE kparam randc 2.5,0.1,0.993 ; CONTROL CURVEPARAMETER WITH CUBIC RANDOM kx linseg 0,p3/2,1,p3/2,0 ; MOVE HORIZONTAL THROUGH THE TERRAIN ky linseg 0,p3,1 ; MOVE VERTICAL THROUGH THE TERRAIN ; TRY THE OTHER CURVES AS WELL asigL wterrain2 0.2, 55*p4, kx, ky, 0.5, 0.4, krot, gisine, gisine, 5, kparam asigR wterrain2 0.2, -55*p4, kx, ky, 0.5, 0.4, krot, gisine, gisine, 5, kparam asigR dcblock asigL asigL dcblock asigR asigL butterlp asigL,9000 asigR butterlp asigR,9000 aL,aR reverbsc asigL, asigR, 0.7, 15000, 44100, 0.5, 1 outs aL*kamp*p5,aR*kamp*p5 endin </CsInstruments> <CsScore> i 1 0 300 1 1 i 1 1 300 7 0.4 i 1 2 299 [9/2] 0.4 i 1 3.1 296.9 [16/3] 0.45 i 1 4.3 295.7 [27/4] 0.5 i 1 6.9 292.1 6 0.5 e </CsScore> </CsoundSynthesizer>