private void Clean(Context context)
{
if (_dirty)
{
if (_va != null)
{
_va.Dispose();
_va = null;
_drawState.VertexArray = null;
_drawStateSolid.VertexArray = null;
}
Mesh mesh = BoxTessellator.Compute(2 * _shape.Radii);
_va = context.CreateVertexArray(mesh, _drawState.ShaderProgram.VertexAttributes, BufferHint.StaticDraw);
_drawState.VertexArray = _va;
_drawStateSolid.VertexArray = _va;
_primitiveType = mesh.PrimitiveType;
_renderState.FacetCulling.FrontFaceWindingOrder = mesh.FrontFaceWindingOrder;
((Uniform<Vector3F>)_drawState.ShaderProgram.Uniforms["u_globeOneOverRadiiSquared"]).Value = _shape.OneOverRadiiSquared.ToVector3F();
((Uniform<Vector3F>)_drawStateSolid.ShaderProgram.Uniforms["u_globeOneOverRadiiSquared"]).Value = _shape.OneOverRadiiSquared.ToVector3F();
if (_wireframe != null)
{
_wireframe.Dispose();
_wireframe = null;
}
_wireframe = new Wireframe(context, mesh);
_wireframe.FacetCullingFace = CullFace.Front;
_wireframe.Width = 3;
_dirty = false;
}
}
private void Update(Context context)
{
if (_dirtyVA)
{
Vector3D radii = new Vector3D(_tileResolution.X, _tileResolution.Y,
(_tileMaximumHeight - _tileMinimumHeight) * _heightExaggeration.Value);
Vector3D halfRadii = 0.5 * radii;
Mesh mesh = BoxTessellator.Compute(radii);
//
// TEXEL_SPACE_TODO: Translate box so it is not centered at
// the origin - world space and texel space will match up.
//
IList<Vector3D> positions = ((VertexAttributeDoubleVector3)mesh.Attributes["position"]).Values;
for (int i = 0; i < positions.Count; ++i)
{
positions[i] = positions[i] + halfRadii;
}
if (_drawState.VertexArray != null)
{
_drawState.VertexArray.Dispose();
_drawState.VertexArray = null;
}
_drawState.VertexArray = context.CreateVertexArray(mesh, _drawState.ShaderProgram.VertexAttributes, BufferHint.StaticDraw);
_primitiveType = mesh.PrimitiveType;
_drawState.RenderState.FacetCulling.FrontFaceWindingOrder = mesh.FrontFaceWindingOrder;
if (_wireframe != null)
{
_wireframe.Dispose();
}
_wireframe = new Wireframe(context, mesh);
_wireframe.FacetCullingFace = CullFace.Front;
_wireframe.Width = 3;
_dirtyVA = false;
}
}
private void CreateScene()
{
DisposeScene();
_ellipsoid = new TessellatedGlobe();
_ellipsoid.Shape = _globeShape;
_ellipsoid.NumberOfSlicePartitions = 64;
_ellipsoid.NumberOfStackPartitions = 32;
///////////////////////////////////////////////////////////////////
Mesh mesh = GeographicGridEllipsoidTessellator.Compute(_globeShape,
64, 32, GeographicGridEllipsoidVertexAttributes.Position);
_wireframe = new Wireframe(_window.Context, mesh);
_wireframe.Width = 2;
///////////////////////////////////////////////////////////////////
_axes = new Axes();
_axes.Length = 1.5;
_axes.Width = 3;
///////////////////////////////////////////////////////////////////
Vector3D p = _globeShape.ToVector3D(new Geodetic3D(0, Trig.ToRadians(45), 0));
Vector3D deticNormal = _globeShape.GeodeticSurfaceNormal(p);
Vector3D centricNormal = Ellipsoid.CentricSurfaceNormal(p);
double normalLength = _globeShape.MaximumRadius;
Vector3D pDetic = p + (normalLength * deticNormal);
Vector3D pCentric = p + (normalLength * centricNormal);
VertexAttributeFloatVector3 positionAttribute = new VertexAttributeFloatVector3("position", 4);
positionAttribute.Values.Add(p.ToVector3F());
positionAttribute.Values.Add(pDetic.ToVector3F());
positionAttribute.Values.Add(p.ToVector3F());
positionAttribute.Values.Add(pCentric.ToVector3F());
VertexAttributeRGBA colorAttribute = new VertexAttributeRGBA("color", 4);
colorAttribute.AddColor(Color.DarkGreen);
colorAttribute.AddColor(Color.DarkGreen);
colorAttribute.AddColor(Color.DarkCyan);
colorAttribute.AddColor(Color.DarkCyan);
Mesh polyline = new Mesh();
polyline.PrimitiveType = PrimitiveType.Lines;
polyline.Attributes.Add(positionAttribute);
polyline.Attributes.Add(colorAttribute);
_normals = new Polyline();
_normals.Set(_window.Context, polyline);
_normals.Width = 3;
///////////////////////////////////////////////////////////////////
Font font = new Font("Arial", 24);
IList<Bitmap> labelBitmaps = new List<Bitmap>(2);
labelBitmaps.Add(Device.CreateBitmapFromText("Geodetic", font));
labelBitmaps.Add(Device.CreateBitmapFromText("Geocentric", font));
font.Dispose();
TextureAtlas atlas = new TextureAtlas(labelBitmaps);
_labels = new BillboardCollection(_window.Context, 2);
_labels.Texture = Device.CreateTexture2D(atlas.Bitmap, TextureFormat.RedGreenBlueAlpha8, false);
_labels.Add(new Billboard()
{
Position = pDetic,
TextureCoordinates = atlas.TextureCoordinates[0],
Color = Color.DarkGreen,
HorizontalOrigin = HorizontalOrigin.Right,
VerticalOrigin = VerticalOrigin.Bottom
});
_labels.Add(new Billboard()
{
Position = pCentric,
TextureCoordinates = atlas.TextureCoordinates[1],
Color = Color.DarkCyan,
HorizontalOrigin = HorizontalOrigin.Right,
VerticalOrigin = VerticalOrigin.Bottom
});
atlas.Dispose();
///////////////////////////////////////////////////////////////////
Vector3D east = Vector3D.UnitZ.Cross(deticNormal);
Vector3D north = deticNormal.Cross(east);
_tangentPlane = new Plane(_window.Context);
_tangentPlane.Origin = p;
_tangentPlane.XAxis = east;
_tangentPlane.YAxis = north;
_tangentPlane.OutlineWidth = 3;
}