SCNGeometry Class
Definition
Important
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Base class for SceneKit geometry objects
[Foundation.Register("SCNGeometry", true)]
public class SCNGeometry : Foundation.NSObject, Foundation.INSCopying, Foundation.INSSecureCoding, IDisposable, SceneKit.ISCNAnimatable, SceneKit.ISCNBoundingVolume, SceneKit.ISCNShadable[<Foundation.Register("SCNGeometry", true)>]
type SCNGeometry = class
inherit NSObject
interface INSCoding
interface INativeObject
interface IDisposable
interface INSCopying
interface INSSecureCoding
interface ISCNAnimatable
interface ISCNBoundingVolume
interface ISCNShadable- Inheritance
- Derived
- Attributes
- Implements
Remarks
All geometry in SceneKit is described by subclasses of SCNGeometry:
| SCNCapsule | A pill-shaped capsule with adjustable end caps |  |
| SCNCone | A cone whose top can be truncated |  |
| SCNBox | A rectangular box. |  |
| SCNCylinder | A cylinder. |  |
| SCNFloor | An infinite plane with the ability to reflect the geometry above it. |  |
| SCNPlane | A one-sided rectangle. |  |
| SCNPyramid | A tetrahedron. |  |
| SCNShape | A 2D shape that has been extruded into the 3rd dimension. |  |
| SCNSphere | A sphere. |  |
| SCNText | Extruded text. |  |
| SCNTorus | A donut shape. |  |
| SCNTube | An uncapped cylinder. | |
Subclasses are typically instantiated with a static Create factory method rather than a constructor.
In addition, SceneKit can load entire scenes from .DAE files with the FromFile(String) method.
Developers can create geometry from a ModelIO mesh using FromMesh(MDLMesh).
Finally, developers can create custom geometry using the Create(SCNGeometrySource[], SCNGeometryElement[]) method with arrays of appropriate SCNGeometrySource and SCNGeometryElement objects. The following shows the creation of a custom pyramid:
//Lower-left
var a = new SCNVector3(-1, -1, 0);
//Upper-right
var b = new SCNVector3(1, 1, 0);
var halfX = (c.X + a.X) / 2;
var halfY = (c.Y + a.Y) / 2;
var halfZ = (c.Z + a.Z) / 2;
var b = new SCNVector3(a.X, c.Y, halfZ);
var d = new SCNVector3(c.X, a.Y, halfZ);
//Elevate the midpoint so that it's clearly a pyramid
var midPoint = new SCNVector3(halfX, halfY, halfZ + 1.0);
//The vertices of the geometry
var locs = new [] {
a, b, c, d, midPoint
};
var locSource = SCNGeometrySource.FromVertices(locs);
//Note that this relies on the ordering of locs above
//and it defines triangles (could be triangle strips, etc.)
var indices = new [] {
//Triangles are defined counter-clockwise!
4, 1, 0,
1, 4, 2,
2, 4, 3,
3, 4, 0
};
var idxArray = new byte[indices.Length][];
for(int i = 0; i < idxArray.Length; i++)
{
idxArray[i] = BitConverter.GetBytes(indices[i]);
}
var idxData = NSData.FromArray(idxArray.SelectMany(id => id).ToArray());
//Note that this relies on indices defining triangles
var element = SCNGeometryElement.FromData(idxData, SCNGeometryPrimitiveType.Triangles, indices.Length / 3, sizeof(int));
//Normals are relative to geometry
var normals = new [] {
new SCNVector3(0, 0, 1),
new SCNVector3(0, 0, 1),
new SCNVector3(0, 0, 1),
new SCNVector3(0, 0, 1),
new SCNVector3(0, 0, 1),
};;
var normSource = SCNGeometrySource.FromNormals(normals);
//These texture coords will cause the texture to wrap
var txCoords = new [] {
new CGPoint(-1, -1),
new CGPoint(-1, 1),
new CGPoint(1, 1),
new CGPoint(1, -1)
};
var txCoordsSource = SCNGeometrySource.FromTextureCoordinates(txCoords);
var geometry = SCNGeometry.Create(new [] { locSource, normSource, txCoordsSource }, new [] { element });
Constructors
| Name | Description |
|---|---|
| SCNGeometry(NativeHandle) |
A constructor used when creating managed representations of unmanaged objects. Called by the runtime. |
| SCNGeometry(NSCoder) |
A constructor that initializes the object from the data stored in the unarchiver object. |
| SCNGeometry(NSObjectFlag) |
Constructor to call on derived classes to skip initialization and merely allocate the object. |