Single Surface System

Blitz3D Forums/Blitz3D Programming/Single Surface System

Idaho Razor

(Posted 2004) [#1]

Hey i'm stumped, on my previous versions of my game i'm just creating grass and using linepick() to randomly position it on my terrain... However it causes a major slowdown in framerate so what i'm trying to do is make a single surface system... but how would i go about duplicating my 3 vertices / 1 triangle without creating the next surface?

here's my code

;Grass Single Surface Grass System
AppTitle "Vertex Test" 
Graphics3D 800,600,16,2
SetBuffer BackBuffer()

Global mesh
Global grasstex

;Create Mesh
mesh = CreateMesh()

;Create Surface
surface = CreateSurface(mesh)

;Create Vertices
v0 = AddVertex(surface,0,2,0,0.5,-1,0)
v1 = AddVertex(surface,2,0,0,1,0,0)
v2 = AddVertex(surface,-2,0,0,0,0,0)

;Create Triangle
grass = AddTriangle(surface,v0,v1,v2)
EntityFX mesh, 16

;Load Grass Texture
grasstex = LoadTexture("HeightMap\Grass\Weed.jpg",4)
EntityTexture mesh, grasstex

;Create Camera
camera = CreateCamera()
PositionEntity camera,0,0,-2

While Not KeyHit(1)

If KeyDown(200)
	MoveEntity camera,0,0,0.1
EndIf

If KeyDown(208)
	MoveEntity camera,0,0,-0.1
EndIf

RenderWorld()
Flip
Wend

End

Ross C

(Posted 2004) [#2]

Just keep adding three more vertices and a triangle to the mesh :o)

Idaho Razor

(Posted 2004) [#3]

should i make a function to keep 3 vertices in a triangle shape?

I copyentity(mesh) and countsurfaces(mesh) came up with only 1 surface... is that a working single surface particle system?

Ross C

(Posted 2004) [#4]

Only one surface on that mesh. Each mesh is a surface on it's own. You need to add more vertices and triangles to the same mesh. Basic sort of example. All the triangles and vertices are added to the one surface.

Press the 1 key to add more grass :o)

Graphics3D 800,600
SetBuffer BackBuffer()

Global camera = CreateCamera()
PositionEntity camera,0,3,-15

Global plane = CreatePlane()
EntityColor plane,50,50,50


Global mesh = CreateMesh()
EntityColor mesh,0,255,0

Global surface = CreateSurface(mesh)



While Not KeyHit(1)

	If KeyHit(2) Then add_grass()

	UpdateWorld
	RenderWorld
	Flip
Wend
End


Function add_grass()

	px = Rnd(-10,10)
	py = 0
	pz = Rnd(-10,10)

	v0 = AddVertex(surface,px  ,py+2, pz, 0.5,-1)
	v1 = AddVertex(surface,px+2,py, pz, 1,0)
	v2 = AddVertex(surface,px-2,py, pz, 0,0)
	
	AddTriangle(surface,v0,v1,v2)
	
	UpdateNormals(mesh)
	
End Function

Idaho Razor

(Posted 2004) [#5]

okay i finally figured it out! thanks alot Ross :-P for a second i thot i'd have to make a hundred vertexes in diff positions with the same triangle :-P thanks for the help!

N	(Posted 2004) [#6]

Decent example of how to do grass.