Amiga Plasma

Rich

Well-known member
CX Code Contributor
3rd Party Module Dev
Tutorial Author
3rd Party Tool Dev
Joined
Sep 9, 2017
Messages
451
Ive been watching lots of Amiga demos and thought Id try out a plasma effect in CX.
For those that dont know, the Plasma effect was demo'd in late 80s in a PC demo, but the due to the features in Amiga hardware, it became a very popular effect in the early 90s. It uses the diamond square algorithm https://en.wikipedia.org/wiki/Diamond-square_algorithm
 

Paul59

New member
CX Code Contributor
Joined
Dec 13, 2018
Messages
375
My old BB code for creating a plasma effect - can't remember what it looks like, probably quite blocky! I've got half a dozen versions and probably as many again written in other languages. Might slap this into CX later see how it looks.

Graphics 640,480,16,1
SetBuffer BackBuffer()
Global r1,r2,ainc
Dim lut(640,480)

For y=0 To 479
For x=0 To 639
If Sin(x+y)>0.1 Then lut(x,y)=1
Next
Next

angle=10
ainc=12
maxcol=64
col_set=1

While Not KeyDown(1)
;Cls
For y=0 To 476 Step 4
For x=0 To 636 Step 4

If lut(x,y) Then

r1 = 20 * Sin( (x)+(angle Shr 3) ) + 40* Sin( (x*2)+(angle Shr 1) ) + 30 * Sin( (x Shr 1) + angle)
r2 = Sin(y+(angle Shr 1)) + 11 * Sin( (y*2)+angle ) + 40 * Sin( y + angle)
col=r1+r2

;don't draw some!
If col >0 And col <maxcol Then
Select col_set
Case 1
Color 0,col,0
Case 2
Color col,0,0
Case 3
Color 0,0,col
End Select
Rect x,y,4,4,1
EndIf
EndIf
Next
Next
Flip

If Rand(50)=1 Then
col_set=Rand(1,3)
EndIf

angle=angle+ainc

Wend
End
 
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