public static IntersectionNode Create()
{
// vertex buffer and index buffer.
var model = new IntersectionModel();
// vertex shader and fragment shader.
var vs = new VertexShader(vertexCode);
var fs = new FragmentShader(fragmentCode);
var array = new ShaderArray(vs, fs);
// which vertex buffer maps to which attribute in shader.
var map = new AttributeMap();
map.Add("inPosition", IntersectionModel.strPosition);
// build a render method.
var polygonModeSwitch = new PolygonModeSwitch(PolygonMode.Line);
var lineWidthSwitch = new LineWidthSwitch(5);
var offsetSwitch = new PolygonOffsetFillSwitch();
var builder = new RenderMethodBuilder(array, map, offsetSwitch, polygonModeSwitch, lineWidthSwitch);
// create node.
var node = new IntersectionNode(model, builder);
// initialize node.
node.Initialize();
return(node);
}
private SceneNodeBase GetRootNode(ICamera modelCamera)
{
var root = new GroupNode();
// render 'scene' to franebuffer.
{
int width = this.winGLCanvas1.Width, height = this.winGLCanvas1.Height;
var rtt = new RenderToTexttureNode(width, height, modelCamera, new ColoredFramebufferProvider());
rtt.BackgroundColor = Color.SkyBlue;
{
var teapot = TeapotNode.Create();
teapot.RenderWireframe = false;
rtt.Children.Add(teapot);// rendered to framebuffer, then to texture.
}
root.Children.Add(rtt);
this.rtt = rtt;
}
{
var group = new GroupNode();
// display 'scene' in rectangle.
{
var node = RectangleNode.Create();
node.TextureSource = this.rtt;
node.Scale = new vec3(1, 1, 1) * 6;
node.RotationAxis = new vec3(-1, 0, 0);
node.RotationAngle = 90;
group.Children.Add(node);
}
const float radius = 3;
// arcball.
{
var model = new HalfSphere(radius, 40, 40);
var node = NoShadowNode.Create(model, HalfSphere.strPosition, HalfSphere.strNormal, model.Size);
var list = node.RenderUnit.Methods[0].SwitchList;
var list1 = node.RenderUnit.Methods[1].SwitchList;
var polygonModeSwitch = new PolygonModeSwitch(PolygonMode.Line);
var offsetSwitch = new PolygonOffsetFillSwitch();
list.Add(polygonModeSwitch);
list1.Add(polygonModeSwitch);
var cmd = node.RenderUnit.Methods[0].VertexArrayObjects[0].DrawCommand as DrawElementsCmd;
cmd.VertexCount = cmd.VertexCount / 2; // render only half a sphere.
group.Children.Add(node);
}
// lines.
{
var node = LinesNode.Create(radius);
group.Children.Add(node);
this.linesNode = node;
}
// fan
{
var node = FanNode.Create(radius);
group.Children.Add(node);
this.fanNode = node;
}
root.Children.Add(group);
this.groupNode = group;
}
return(root);
}
