Truevision3D - Community Forums - AddVertex/Mesh problem: can't see it (C#)

Hi all. Completely new to this engine and am I bit stuck on some code. I know the problem is simple but I was hoping someone could lend me a hand. Basically I can init the engine but when I try to create a mesh (via AddVertex) it never displays.

Any suggestions?

Code:

... usual C# init code (forms, setup, etc) ...

// vis_engine is an object of type TVEngine

private void Main_Loop() {
vis_engine.SetViewport(vis_engine.tv_viewport);

while (ContinueRender == true)
{
vis_engine.Clear(false);
vis_engine.tv_scene.RenderAllMeshes(true);
vis_engine.RenderToScreen();
System.Windows.Forms.Application.DoEvents();
}
}

public class VisualizationEngine : TVEngineClass {
//TVEngine tv_engine;
public TVViewport tv_viewport;
public TVScene tv_scene;
public TVInputEngine tv_input;
public TVGlobals tv_globals;
public TVMaterialFactory tv_material;
public TVCamera tv_camera;

TVMesh testMesh;
public TV_3DVECTOR cameraPos;

public VisualizationEngine(int handle)
{
InitEngine(handle);
}

private void InitEngine(int handle) {
this.Init3DWindowed(handle, true);
this.SetSearchDirectory(Application.StartupPath);
this.SetDebugFile(Application.StartupPath + "\\Debug.txt");
this.SetAntialiasing(true, CONST_TV_MULTISAMPLE_TYPE.TV_MULTISAMPLE_4_SAMPLES);
this.DisplayFPS(true, 1);

tv_globals = new TVGlobals();
tv_scene = new TVScene();
tv_input = new TVInputEngine();
tv_input.Initialize(true, true);

tv_viewport = new TVViewport();
tv_viewport = this.CreateViewport(handle, "tv_viewport");
tv_viewport.SetAutoResize(true);
tv_viewport.SetBackgroundColor(tv_globals.RGBA(1f, 1f, 1f, 0f));

ShowSplashScreen();
}

// draw a cylinder
public void ShowSplashScreen()
{
testMesh = new TVMesh();
testMesh = tv_scene.CreateMeshBuilder("test");
testMesh.SetPrimitiveType(CONST_TV_PRIMITIVETYPE.TV_TRIANGLESTRIP);
testMesh.SetColor(tv_globals.RGBA(0.8f, 0.5f, 0.5f, 1f), true);
int sides = 30;
float inc = 2 * (float)System.Math.PI / sides;
float x = 0;
float y = 0;
float z = 0;
float theta = 0;
int radius = 40;
int height = 40;
testMesh.SetPosition(0.0f, 0.0f, 0.0f);
tv_scene.SetCamera(0.0f, 0.0f, -15.0f, 0.0f, 0.0f, 10.0f);

for (int i=0; i<sides; i++) {
x = radius * (float)System.Math.Cos(theta);
y = height;
z = radius * (float)System.Math.Sin(theta);

testMesh.AddVertex(x, 0, z, 0, 0, 1, 0, 0, 0, 0, 200);
testMesh.AddVertex(x, y, z, 0, 0, 1, 0, 0, 0, 0, 200);

theta += inc;
}

}

}

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