Author Topic: Auto-rounded 3D block landscapes  (Read 6811 times)

Offline Kitty Hello

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Re: Auto-rounded 3D block landscapes
« Reply #15 on: 2012-Jan-08 »
My bilboards are reay X_OBJ.. objects. Here's the code to create them:

Code: (glbasic) [Select]

// draw sprites after the camera was set
FUNCTION DrawBillboards%: id%, idtexture%, blockpix%, sprites[] AS Tsprite3D

LOCAL tx, ty
GETSPRITESIZE idtexture%, tx, ty
LOCAL nperrow% = INTEGER(tx / blockpix)
GetTextureSize(idtexture%, tx, ty)


// texture size of a half pixel movement
LOCAL offset = 0.50
LOCAL halfpx_x = offset / tx
LOCAL halfpx_y = offset / ty

// scale factor to make a block 1 pixel smaller on texture than required
// we want edge[0,0] be on center of pixel 0,0;
// and edge[1,0] on center of pixel 15 (if blocksize=16)
LOCAL txblockscale = (blockpix - 2.0*offset)/(1.0 * blockpix)
LOCAL tyblockscale = (blockpix - 2.0*offset)/(1.0 * blockpix)

// make tx/ty be the texture size of one block
tx = blockpix / tx
ty = blockpix / ty



LOCAL mat[]
X_GETCAMERAMATRIX mat[]


// X_SPOT_LT 0, 0, 0,0,0,  0,0,0, 0
X_AUTONORMALS 1
X_OBJSTART id%

LOCAL h = 1.0, w = 0.5*h // size of this sprite
// we need the "X" axis direction for the x-values of the sprite
LOCAL dxx =mat[0], dxy=mat[4], dxz=mat[8] // dxy = 0.0 it camera-up is Y
LOCAL upx =mat[1], upy=mat[5], upz=mat[9]


LOCAL uw = tx * txblockscale // width of image to texture (15px for 16px blocks)
LOCAL vh = ty * tyblockscale

FOREACH spr IN sprites[]
LOCAL deltau = MOD(spr.id%, nperrow)       // number of blocks to move
LOCAL deltav = INTEGER(spr.id% / nperrow%) // nof blocks

LOCAL u0 = halfpx_x + deltau * tx
LOCAL v0 = halfpx_y + deltav * ty

X_OBJADDVERTEX spr.x+w*dxx, spr.y-w*dxy+h, spr.z+w*dxz, u0+uw,v0   , 0xffffff
X_OBJADDVERTEX spr.x+w*dxx, spr.y-w*dxy  , spr.z+w*dxz, u0+uw,v0+vh, 0xffffff
X_OBJADDVERTEX spr.x-w*dxx, spr.y-w*dxy+h, spr.z-w*dxz, u0   ,v0   , 0xffffff
X_OBJADDVERTEX spr.x-w*dxx, spr.y-w*dxy  , spr.z-w*dxz, u0   ,v0+vh, 0xffffff
X_OBJNEWGROUP
NEXT
X_OBJEND

X_MOVEMENT 0,0,0
X_SCALING 1,1,1

X_CULLMODE 1

SMOOTHSHADING FALSE
X_SETTEXTURE idtexture%, -1
X_DRAWOBJ id%, 0
ENDFUNCTION


Offline mentalthink

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Re: Auto-rounded 3D block landscapes
« Reply #16 on: 2012-Jan-12 »
Thanks Gernnot  :nw: :nw: