add 3d props to properties doc

source/presentation/4.0/properties.md

@@ -6,10 +6,164 @@
 
 #### label (etc)
 
+
+
 ### Linking Properties
 
 ### Technical Properties
 
+#### backgroundColor
+
+This property sets the background color behind any painted resources on a spatial resource, such as a Canvas or Scene.
+
+The value _MUST_ be string, which defines an RGB color. It SHOULD be a hex value starting with "#" and is treated in a case-insensitive fashion. If this property is not specified, then the default value is client-dependent.
+
+ * A Canvas _MAY_ have the `backgroundColor` property<br/>
+   Clients _SHOULD_ render `backgroundColor` on any resource type.
+ * A Scene _MAY_ have the `backgroundColor` property<br/>
+   Clients _SHOULD_ render `backgroundColor` on any resource type.
+ * Other resources _MUST NOT_ have the `backgroundColor` property.
+
+```json
+"backgroundColor": "#FFFFFF"
+```
+
+<div style="background: #A0F0A0; padding: 10px; padding-left: 30px; margin-bottom: 10px">
+❓Can you set bgColor on a transparent image? An area? Conflict with `style` on a SpecificResource?
+</div>
+
+
+
+##### near
+
+This property gives the distance from the camera from which objects are visible. Objects closer to the camera than the `near` distance cannot be seen.
+
+The value is a non-negative floating point number. If this property is not specified, then the default value is client-dependent.
+
+* A Camera _MAY_ have the `near` property<br/>
+  Clients _SHOULD_ process the `near` property on Cameras.
+
+```json
+"near": 1.5
+```
+
+##### far
+
+This property gives the distance from the camera after which objects are no longer visible. Objects further from the camera than the `far` distance cannot be seen.
+
+The value is a non-negative floating point number, and _MUST_ be greater than the value for `near` on the same camera. If this property is not specified, then the default value is client-dependent.
+
+* A Camera _MAY_ have the `far` property<br/>
+  Clients _SHOULD_ process the `far` property on Cameras.
+
+```json
+"far": 200.0
+```
+
+##### fieldOfView
+
+_Summary here_
+
+The value _MUST_ be a floating point number greater than 0 and less than 180. If this property is not specified, then the default value is client-dependent.
+
+* A PerspectiveCamera _SHOULD_ have the `fieldOfView` property.<br/>
+  Clients _SHOULD_ process the `fieldOfView` property on Cameras.
+
+```json
+  "fieldOfView": 50.0
+```
+
+##### angle
+
+_Summary here_
+
+The value _MUST_ be a floating point number greater than 0 and less than 90. If this property is not specified, then the default value is client-dependent.
+
+* A SpotLight _SHOULD_ have the `angle` property.<br/>
+  Clients _SHOULD_ process the `angle` property on SpotLights.
+
+```json
+  "angle": 15.0
+```
+
+##### lookAt
+
+_Summary here_
+
+The value _MUST_ be a JSON object, conforming to either a reference to an Annotation with an `id` and a `type` of "Anntoation", or a PointSelector. If this property is not specified, then the default value is null -- the camera or light is not looking at anything.
+
+```json
+"lookAt": {
+    "type": "PointSelector",
+    "x": 3,
+    "y": 0,
+    "z": -10
+}
+```
+
+##### color
+
+This property sets the color of a Light.
+
+The value _MUST_ be string, which defines an RGB color. It SHOULD be a hex value starting with "#" and is treated in a case-insensitive fashion. If this property is not specified, then the default value is "#FFFFFF".
+
+ * A Light _SHOULD_ have the `color` property<br/>
+   Clients _SHOULD_ render `color` on any resource type.
+ * Other resources _MUST NOT_ have the `color` property.
+
+```json
+"color": "#FFA0A0"
+```
+
+##### intensity
+
+This property sets the strength or brightness of a Light.
+
+The value _MUST_ be a JSON object, that has the `type`, `value` and `unit` properties. All three properties are required. The value of `type` _MUST_ be the string "Value". The value of `value` is a floating point number. The value of `unit` is a string, drawn from a controlled vocabulary of units. If this property is not specified, then the default intensity value is client-dependent.
+
+This specification defines the unit value of "relative" which constrains the value to be a linear scale between 0.0 (no brightness) and 1.0 (as bright as the client will render).
+
+* A Light _SHOULD_ have the `intensity` property.<br/>
+  Clients _SHOULD_ process the `intensity` property on Lights.
+
+```json
+{
+ "intensity": {"type": "Value", "value": 0.5, "unit": "relative"}
+}
+```
+
+##### Exclude
+
+_Summary here_
+
+_On Annotation, a list of strings drawn from table_
+
+| Value      | Description |
+|------------|-------------|
+| Audio      | |
+| Animations | |
+| Cameras    | |
+| Lights     | |
+
+```json
+"exclude": [ "Audio", "Lights", "Cameras", "Animations" ]
+```
+
+
+##### transform
+
+_Summary here_
+
+The value of this property is an array of JSON objects, each of which is a Transform.
+
+##### x
+
+##### y
+
+##### z
+
+
+
 ### Structural Properties
 
 ### Values