show/hide prim with llSetLinkPrimitiveParamsFast

[Dorex Delicioso]

Hi

I'm trying to show or hide a prim using

llSetLinkPrimitiveParamsFast(LINK_THIS,[ PRIM_ALPHA_MODE, ALL_SIDES, PRIM_ALPHA_MODE_MASK, 255 ]);

I can do it using /llSetLinkAlpha(LINK_SET, 1.0, ALL_SIDES); etc, but I'm having trouble with the correct values for

PRIM_ALPHA_MODE_MASK and the integer that follows it.

I have tried PRIM_ALPHA_MODE_NONE and PRIM_ALPHA_MODE_MASK, but neither seem to hide it

 

Thanks for your help.

DD

 

[Dora Gustafson]

You should use: [ PRIM_COLOR, integer face, vector color, float alpha ]
See: PRIM_COLOR

Setting alpha together with color isn't always what you want, but that is how it is

Alpha mode is something different.

:smileysurprised::smileyvery-happy:

[Nova Convair]

The PRIM_ALPHA_MODE can be used to change transparency but you need to create a 32 bit texture for that. 3 normal 8 bit RGB layers and a 8 bit transparency layer. Saved in PNG or TGA format.

PRIM_ALPHA_MODE_NONE - switches off the transparency layer so the face will show the texture 
PRIM_ALPHA_MODE_BLEND - will use the transparency layer in the normal 8 bit mode. ("supports" the transparency bug )
PRIM_ALPHA_MODE_MASK - will use the transparency layer in a 1 bit mode and the mask_cutoff parameter is the switching value (no transparency bug)

So witching between PRIM_ALPHA_MODE_NONE and PRIM_ALPHA_MODE_MASK can make your object visible/invisible if you have a texture with the correct alpha layer applied.

A side effect is that this will force your object into the LI system (Land Impact). That can lower your objects LI but can also increase it sgnificantly.