ssp - billboard effect - how ?

Blitz3D Forums/Blitz3D Beginners Area/ssp - billboard effect - how ?

The forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.

Hello.
Im developing a single surface particle system using pure triangles.
Moving and rotating(relative to world/x,y,z-own axis) triangles within a surface/mesh works great, no problems there.

But how can i create that billboarding effect like sprite-billboarding?

i have the coordinates

;origin/center of tri
tris\x0
tris\y0
tris\z0

;first vertex
tris\x1
tris\y1
tris\z1

;second vertex
tris\x2
tris\y2
tris\z2

;last vertex
tris\x3
tris\y3
tris\z3

+camera coordinates.

Surfed the blitzbasic.com community + some others for two days now, but couldn´t find a hint, in some other particle systems the authors use tformvector(), didn´t work for me.

Help would be really appreciated.

MfG
Cy