Water algorithm messed up a bit?
Blitz3D Forums/Blitz3D Programming/Water algorithm messed up a bit?
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| How can I make it so my water appears as if you're looking at water on the beach, but I do it w/ a plane? I need to know how to randomly make it slowly sway up and down WITHOUT it eventually going over the top of my level |
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| Use a simple integer timer and increment it as required: global Mytimer const Max_Wave_Height = 10 . . . while not keyhit(1) Mytimer = ( Mytimer + 1 ) mod 360 waterlvl# = sin( Mytimer ) * Max_Wave_Height positionentity water, 0, waterlvl, 0 renderworld() flip wend |
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| Use sine... This will also simulate the slowdown and reversal of real water ang#=ang#+0.1 z#=Sin(ang#) PositionEntity plane,0.0,z#,0.0 If z#> 360 Then z#=0.0 A quick demo, but this is crap code(TM), so replace with your own routine ; CreateTerrain Example ; --------------------- SeedRnd MilliSecs() Graphics3D 640,480 SetBuffer BackBuffer() camera=CreateCamera() PositionEntity camera,0,7,0 light=CreateLight() RotateEntity light,90,0,0 sea_tex=CreateTexture( 256,256 ) SetBuffer TextureBuffer( sea_tex ) For x = 0 To 255 For y = 0 To 255 Color 0,0,Rnd(150,155) Rect x,y,1,1,1 Next Next ter_tex=CreateTexture( 256,256 ) SetBuffer TextureBuffer( ter_tex ) For x = 0 To 255 For y = 0 To 255 :Color Rnd(0,50),Rnd(50,255),Rnd(0,50) Color 0,200,0 Rect x,y,1,1,1 Next Next ; Create terrain terrain=CreatePlane() EntityTexture terrain,ter_tex RotateEntity terrain,0,0,5 ; Create plane plane=CreatePlane() EntityTexture plane,sea_tex While Not KeyDown( 1 ) ang#=ang#+0.1 If KeyDown( 205 )=True Then TurnEntity camera,0,-1,0 If KeyDown( 203 )=True Then TurnEntity camera,0,1,0 If KeyDown( 208 )=True Then MoveEntity camera,0,0,-0.05 If KeyDown( 200 )=True Then MoveEntity camera,0,0,0.05 z#=Sin(ang#) PositionEntity plane,0.0,z#,0.0 If z#> 360 Then z#=0.0 RenderWorld Text 0,0,"Use cursor keys to move about the terrain" Flip Wend End |
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| @ Andy, excellent advice - see the post immediately above yours ;) p.s. What is the point of: "If z#> 360 Then z#=0.0" ? |
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| You're right... Must be something along the lines of 'Great minds think alike' I suppose :) |
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| p.s. What is the point of: "If z#> 360 Then z#=0.0" ? My guess is that should be " if ang# > 360 then ang# is 0.0" instead? z# will always be between -1 and 1, given that it's the sin() of ang#... |
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| My guess is that should be " if ang# > 360 then ang# is 0.0" instead? z# will always be between -1 and 1, given that it's the sin() of ang#... Clearly, but for the animation to be continuous if should actually be: If ang# > 360 then ang# = ang# - 360 |
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| Keeping it to the sin either way would ensure the 'direction' is continous. |
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| theres a slight problem w/ doing it that way. i have fixed it, but there was yet another problem w/ it i cant get it when it reaches 0.7 to go down FROM 0.7 to -0.7 by .01 instead, it goes to a negative and goes back up the problem is |
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| @Rez, Yes, there is a slight problem in that you are not doing it the way which was suggested. |
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| but i dont want it to go all the way to 360 i want it to go FROM a set position back down TO set position i need it to go EXTREMELY slow so it looks like a beach |
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| For someone who clearly has very little experience in programming your attitude sucks towards those trying to help. A continuous sine wave which is simulating a water wave needs to wrap from 0 to 360 degrees. A ping-pong effect from -0.7 to +0.7 degrees will not look good. If you really want to try it, instead of : ang#=ang#+.01 If ang# > 0.7 ang# = .01-ang# EndIf If ang# < -0.7 ang# = .01+ang# EndIf Use ang# = ang# + dir# if abs( ang ) > 0.7 dir# = - dir# Where you must define Dir# = 0.01 before the loop. Alternatively, to slow the wave motion in the example below, either lower the value of Wave_Height (to reduce the maximum peak/trough of the wave) or reduce the number which ang is incremented by (to reduce the frequency of the wave). While not explained fully, this is exactly what I suggested in my first post. ; CreateTerrain Example ; --------------------- SeedRnd MilliSecs() Graphics3D 640,480,0,2 SetBuffer BackBuffer() const Wave_Height# = 0.7 camera=CreateCamera() PositionEntity camera,0,7,0 light=CreateLight() RotateEntity light,90,0,0 sea_tex=CreateTexture( 256,256 ) SetBuffer TextureBuffer( sea_tex ) For x = 0 To 255 For y = 0 To 255 Color 0,0,Rnd(150,155) Rect x,y,1,1,1 Next Next ter_tex=CreateTexture( 256,256 ) SetBuffer TextureBuffer( ter_tex ) For x = 0 To 255 For y = 0 To 255 :Color Rnd(0,50),Rnd(50,255),Rnd(0,50) Color 0,200,0 Rect x,y,1,1,1 Next Next SetBuffer BackBuffer() ; Create terrain terrain=CreatePlane() EntityTexture terrain,ter_tex RotateEntity terrain,0,0,5 ; Create plane plane=CreatePlane() EntityTexture plane,sea_tex While Not KeyHit(1) ang#= ( ang# + 1 ) Mod 360 If KeyDown( 205 )=True Then TurnEntity camera,0,-1,0 If KeyDown( 203 )=True Then TurnEntity camera,0,1,0 If KeyDown( 208 )=True Then MoveEntity camera,0,0,-0.05 If KeyDown( 200 )=True Then MoveEntity camera,0,0,0.05 z#= Wave_Height * Sin(ang#) PositionEntity plane,0,z#,0 UpdateWorld RenderWorld Text 0,0,"Use cursor keys to move about the terrain" Text 0,10,"ang#:"+ang# Flip Wend End |
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| thanks! that worked wonders! |
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