image featur request

Blitz3D Forums/Blitz3D Programming/image featur request

Rook Zimbabwe

(Posted 2004) [#1]

I like the ability to adjust entityalpha. It has come on handy a time or two.

My feature request is some form of imagealpha command.

I use a PNG for my aimpoint in my fps. Being able to change the alpha depending on if I was on a target or not would be cool.

Maybe there is a simple way to do this but I don't know it.

Anyone got any ideas?
-Rook

Ross C

(Posted 2004) [#2]

I'd suggest not making 2d images with 3d graphics. It will slow your game down on some/alot of machines. Some graphics cards don't like mixing 2d and 3d. Best off using a sprite, then you get all the benefits of alpha, rotation and scaling :)

Rook Zimbabwe

(Posted 2004) [#3]

so I can use a sprite as an aimpoint? I hadn't thought of that...
-RZ

Rottbott

(Posted 2004) [#4]

Parent it to the camera and use EntityOrder to make sure it is always drawn in front. That way you can use the alpha channel (or a mask) in your image.

WolRon

(Posted 2004) [#5]

so I can use a sprite as an aimpoint?

of course

Rook Zimbabwe

(Posted 2004) [#6]

EntityOrder... another new command to learn! : )

The knowledge never stops but it is so much fun!

-Z

N	(Posted 2004) [#7]

Here's some basic code you could use as an example (I haven't tested it, so bear with me here).

;; Basic Setup
C = CreateCamera()
S = CreateSprite()
T = CreateTexture(16,16)

;; Create cross-hair texture
SetBuffer(TextureBuffer(T))
Color 0,0,0
Rect 0,0,16,16,True
Color 255,255,255
Rect 0,0,16,16,False
Line 8,0,8,16
Line 0,8,16,8
SetBuffer(BackBuffer())

;; Set up cross-hair sprite
EntityTexture S,T,0,0
EntityOrder S,-100
EntityBlend S,3
EntityParent S,C,0
PositionEntity S,0,0,100

Neochrome

(Posted 2004) [#8]

you may need to use Pixies ( donno the link tho )

Rook Zimbabwe

(Posted 2004) [#9]

So I couldn't use a PNG or JPG as a sprite...
-RZ

jhocking

(Posted 2004) [#10]

Sure. Just replace CreateSprite with LoadSprite and load your image.