how to use vertexcolor ?

I try to put color on triangle of an object with the "vertexcolor" command but my object is always blank.

is someone can help me ?

hereafter the code :

Graphics3D 640,480
SetBuffer BackBuffer()

camera=CreateCamera()

AmbientLight 255,255,255

objet = CreateMesh()
surf=CreateSurface(objet)


v0=AddVertex(surf,0,0,0) ; bottom corner 1
v1=AddVertex(surf,0,0,1) ; bottom corner 2
v2=AddVertex(surf,4,0,1) ; bottom corner 3
v3=AddVertex(surf,4,0,0) ; bottom corner 4
v4=AddVertex(surf,0,2,0) ; top corner 1
v5=AddVertex(surf,0,2,1) ; top corner 2

t0=AddTriangle(surf,v0,v3,v2) ; bottom triangle 1
t1=AddTriangle(surf,v0,v2,v1) ; bottom triangle 2
t2=AddTriangle(surf,v0,v4,v3) ; front triangle
t3=AddTriangle(surf,v1,v2,v5) ; back triangle
t4=AddTriangle(surf,v0,v1,v5) ; side triangle 1
t5=AddTriangle(surf,v0,v5,v4) ; side triangle 2
t6=AddTriangle(surf,v2,v4,v5) ; top triangle 1
t7=AddTriangle(surf,v2,v3,v4) ; top triangle 2

PositionEntity objet,0,-4,10

UpdateNormals objet

VertexColor surf, v0, 255,0,0
VertexColor surf, v1, 255,0,0
VertexColor surf, v2, 255,0,0
VertexColor surf, v3, 255,0,0
VertexColor surf, v4, 255,0,0
VertexColor surf, v5, 255,0,0

;WireFrame True

While Not KeyDown(1)

TurnEntity objet,0,1,0

RenderWorld
Flip

Wend

You have to tell blitz you want to use vertex colours...

EntityFX objet, 2

Should do the trick :o)

it works.

thanks