Tutorials › dbc Classic › 4

Textures

Turn plain shapes into bricks and crystal: load a picture, wrap it, repeat it, slide it.

What you need

bricks.jpgexamples/dbc/tutorials/3d/

crystal.jpgexamples/dbc/tutorials/3d/

Copy both files from the repository next to your .dba. Relative paths are resolved from the program's folder.

Images and textures

LOAD IMAGE reads a picture into a numbered image slot. TEXTURE OBJECT wraps that image around an object. One image can texture many objects.

textures_load.dba excerptDownload

load image "bricks.jpg", 1
make object box 1, 60, 30, 2
texture object 1, 1

Repeat and scroll

A big wall with one brick picture looks stretched. SCALE OBJECT TEXTURE repeats the image: here 4 times across and 2 times down. SCROLL OBJECT TEXTURE slides it every frame, which is how you make conveyor belts, rivers or moving skies.

textures_scroll.dba excerptDownload

scale object texture 1, 4, 2
...
scroll object texture 1, 0.002, 0

See-through objects

GHOST OBJECT ON blends an object with what is behind it. It suits glass, water, flames and glowing effects.

textures.dbaDownload

rem Textures - OpenDBC tutorial (DarkBASIC Classic)
rem Media: bricks.jpg and crystal.jpg from examples/dbc/tutorials/3d
sync on : sync rate 60
autocam off
color backdrop rgb(12, 14, 24)

rem Load pictures into image slots 1 and 2
load image "bricks.jpg", 1
load image "crystal.jpg", 2

rem A brick wall: the texture repeats 4 times across, 2 times down
make object box 1, 60, 30, 2
position object 1, 0, 0, 20
texture object 1, 1
scale object texture 1, 4, 2

rem A crystal cube in front of it
make object cube 2, 12
position object 2, -15, 0, 0
texture object 2, 2

rem The same crystal, ghosted: you can see the wall through it
make object cube 3, 12
position object 3, 15, 0, 0
texture object 3, 2
ghost object on 3

position camera 0, 6, -45
point camera 0, 0, 0

do
   yrotate object 2, wrapvalue(object angle y(2) + 1)
   yrotate object 3, wrapvalue(object angle y(3) - 1)
   rem Slide the bricks sideways, like a conveyor
   scroll object texture 1, 0.002, 0
   sync
loop

Try this

Texture a sphere with crystal.jpg.
Fade the ghost cube with FADE OBJECT.
Show the wireframe with SET OBJECT: the wireframe flag is the argument immediately after the object number.

The repository's materials.dba puts eight material settings side by side.