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Finally!! I eventually worked out bump mapping! Took long enough!

Yes, it is unoptimised, mainly because I want to keep the code neat. Ill probably optimise it later.

EDIT: Optimised better version down the page! \/ \/ \/

Code:
'$DYNAMIC

DIM bumpmap(100, 100)

DIM envmap(100, 100)

SCREEN 13

FOR i = 1 TO 255

  OUT &H3C8, i: OUT &H3C9, i / 255 * 63: OUT &H3C9, i / 255 * 63: OUT &H3C9, i / 255 

* 63

NEXT

FOR x = 1 TO 100

  FOR y = 1 TO 100

    PSET (x, y), INT(RND * 255) + 1

  NEXT

NEXT

FOR s = 1 TO 2

  FOR x = 1 TO 100

    FOR y = 1 TO 100

      PSET (x, y), (POINT(x - 1, y - 1) + POINT(x, y) + POINT(x + 1, y - 1) + 

POINT(x - 1, y + 1) + POINT(x + 1, y + 1) + POINT(x + 1, y) + POINT(x - 1, y) + 

POINT(x, y + 1) + POINT(x, y - 1)) / 9

    NEXT

  NEXT

NEXT

FOR x = 1 TO 100

  FOR y = 1 TO 100

    bumpmap(x, y) = POINT(x, y)

  NEXT

NEXT

CLS

FOR x = 1 TO 100

  FOR y = 1 TO 100

    normx = (x - 50) / 50

    normy = (y - 50) / 50

    normz = 1 - SQR(normx ^ 2 + normy ^ 2)

    IF normz < 0 THEN normz = 0

    envmap(x, y) = normz * 255

  NEXT

NEXT

DO

  a = a + 4

  IF a > 360 THEN a = a - 360

  lightx = COS(a * 3.14 / 180) * 30 + 50

  lighty = SIN(a * 3.14 / 180) * 30 + 50

  FOR x = 2 TO 99

    FOR y = 2 TO 99

      vx = x - lightx

      vy = y - lighty

      normalx = bumpmap(x + 1, y) - bumpmap(x - 1, y) - vx + 50

      normaly = bumpmap(x, y + 1) - bumpmap(x, y - 1) - vy + 50

      IF normalx > 100 THEN normalx = 100

      IF normaly > 100 THEN normaly = 100

      IF normalx < 1 THEN normalx = 1

      IF normaly < 1 THEN normaly = 1

      PSET (x, y), envmap(normalx, normaly)

    NEXT

  NEXT

LOOP

Ok its slow. Bite me.

Awesome, dude. Smile

(what's a bump map?)

Edit: @dark_prevail: That's some really nice stuff!

@Zack: You use a bumpmap when you have an 3d object,
but it would take too many polygons to make it detailed, like
the roughness of a stone etc... The bumpmap is an image
that is placed on the object like a texture and then adds
highlights/shadows based on for example the grey value of the
"active" part of the bumpmap

(Like a sim city (x,y) array where every entry tells how
high the house is

...or something like that)

or like this, from Halo: (halo has beautiful bump mapping effects)

the surface is actually just a flat texture, but is is bump mapped in real time to appear to have depth.

[Image: bt-game.jpg]

Red)marvin: Thanx! ^_^

Halo...*Drools*
Okay, cool. I suppose that's used in pretty much all 3D commercial computer games, hm? Like in Return to Castle Wolfenstein, the walls in some levels have a nice stony texture. Bumpmapped? Or is there an alternate method?

well, the only alternative I could think of would be actually modeling the detail itself... 1000s of extra polys! Ahh!

Another bumpmap example:

[Image: klot.GIF]

Sorry for the grainyness, I saved it as gif directly from paint...

Here:

http://rel.betterwebber.com/junk.php?id=1

First effect. :*)

Dad: Kool FX. :*)

Ok. Heres a better version - Optimised, with highlights and a good bumpmap.

Note: you can change the bumpmap by making a new GIF file and saving it as "bumpmap2.gif" Lighter colours mean a higher surface. darker colours mean the surface is lower. You really must very slightly blur/antialias the picture beforehand. sharp edges will not work well.

Bump.zip

That's really cool, how do you do the light? Which lib?

This is really cool, i've been watching it now for 5 minutes straight...

shadows.. *drools*.. bumpmapping *more drooling* light source *goes insane*

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KiZ

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