http://en.wikipedia.org/wiki/Transforma ... D_graphicsThat's a 2D matrix.
Rotation by 90° or -90°:
Code:
0 1 or 0 -1
-1 0 1 0
Scale by 5:
Code:
5 0
0 5
For other operations, you need to know something about 2D matrices
Code: Select all
def clouds(vec3 pos) real:
let
D = dist(vec3(0.0, 0.0, -6378135.0), pos)
useBox = paramBox()==1
radius = 6380135.0
lower = 6379135.0
offset = 1000.0
range = if(useBox, (pos.z-lower)/offset, (D-lower)/offset)
noisePos = pos * 0.0005
# fuzzyPos = noisePos * (fbm(noisePos * 0.05, 6) * 0.025 + 1.0)
noize = abs(fbm(noisePos,2))
# curve = pow(range, fbm01(noisePos * 10.0, 8)*0.5 + 0.5)
# curve = pow(range, noize)
curve = pow(range, paramPower())
S = sin(range * 3.1416)
# radius = radius + noize * offset * 0.5
aboveClouds = if(useBox, pos.z>radius, D>radius)
belowClouds = if(useBox, pos.z<lower, D<lower)
paramShapeShift = fbm01(noisePos * 6.0, 4)
shaping = (curve) * (1.0 - paramShapeShift) + (1.0 - curve) * paramShapeShift
signal = S * noize - (shaping * paramShapeStrength()) + paramOffset()
clouds = if(paramSoftClouds()==1, signal, if(signal>0.25, 1.0, 0.0))
cloudless = 0.06
in
if( aboveClouds,
cloudless,
if( belowClouds,
cloudless,
# else
clouds
)
)
def eval(vec3 pos) vec3:
vec3(
clouds(pos) * 0.025
)
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