new Geometry()
Base class for objects describing webGl geometry. All geometry is stored in a circular buffer. Buffer size is fixed on construction
Handy-Dandy Glossary: A vertex is composed of three coordinates A coordinate is the component of a vertex in a single axis Length refers to the number of elements in an array Size refers to byte length of a buffer Index refers to the index of an element in an array Offset refers to byte location in a buffer
Note that for 8bit buffers, index and offset, size and length, will both refer to the same location and capacity, but the terminology should remain consistent regardless.
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Extends
Methods
_rebuildLists()
Rebuild lists for this drawable and notify any parent drawable to do so as well. This ensures each drawable contains an updated, flat list of all the drawables beneath them. This way we save performance by not recursing through each child during draw time, and instead, drawing from the flat list at the level we care about.
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add(children)
Add a child drawable to this instance
Parameters:
| Name | Type | Description |
|---|---|---|
children |
Array.<Drawable> | Drawable | child drawables to add |
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addVertices(coords)
Add vertices to this geometry object
Parameters:
| Name | Type | Description |
|---|---|---|
coords |
Array.<Float> | Packed array of floating point coordinats. (e.g. [x1,y1,z1,x2,y2,z2,...xn,yn,zn]) |
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draw()
Base draw method, which should always be called by subclasses. This method will perform any updates to dirty geometry buffers, but does not actually perform any drawing itself.
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drawCircular()
Draws the circular buffer as a line strip,
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remove(children)
Remove a child drawable from this instance
Parameters:
| Name | Type | Description |
|---|---|---|
children |
Array.<Drawable> | Drawable | child drawables to remove |
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setShaderPosition(gl, shader)
Set up a vertex shader's modelView and projection matrixes, and assign the position of the vertex buffer for this geometry.
Parameters:
| Name | Type | Description |
|---|---|---|
gl |
WebGl | Webgl context |
shader |
Shader | Shader instance |
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Type Definitions
Options
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