Add default viewpoint

Update CHANGES.md

CHANGES.md

@@ -4,6 +4,9 @@ CHANGES
 dev
 ---
 
+Improvements:
+- Add default viewpoint (#61)
+
 Documentation:
 - Add more examples (#59)
 

docs/documentation.md

@@ -43,7 +43,7 @@ The main function of mathics-threejs-backend is `drawGraphics3d`, takes the foll
     - `ymax` (type: number)
     - `zmax` (type: number)
   - `lighting` (type: [element[]](/mathics-threejs-backend/types/element)) — array of lights, default: `[]`
-  - `viewpoint` (type: number[3]) — the normalized camera coordinate (normalized means that the coordinate is going to be scaled, e.g. `[1, 1, 1]` is the upper back right corner of the bounding box independently from its size)
+  - `viewpoint` (type: number[3]) — the normalized camera coordinate (normalized means that the coordinate is going to be scaled, e.g. `[1, 1, 1]` is the upper back right corner of the bounding box independently from its size). Default: `[1.3, -2.4, 2]`
   - `protocol` (type: string) — protocol version (current is `1.2`), if it isn't compatible a warning is shown instead of the graphics. Only availiable in production version
 - `maxSize` (type: number) — default: `400`
 - `innerWidthMultiplier` (type: number) — the multiplier of the window inner width, the effective width is `min(maxSize, innerWidthMultiplier * window.innerWidth)`, default: `0.65`

src/graphics3d.js

@@ -22,7 +22,7 @@ export default function (
 		extent,
 		elements = [],
 		lighting = [],
-		viewpoint
+		viewpoint = [1.3, -2.4, 2]
 	},
 	maxSize = 400,
 	innerWidthMultiplier = 0.65