I provide clipping capabilities for rasterizers needing explicit clipping.

	clipping polygons
	clipPolygon:count:with:mask: clipPolygonBackFrom:to:count: clipPolygonBottomFrom:to:count: clipPolygonFrontFrom:to:count: clipPolygonLeftFrom:to:count: clipPolygonRightFrom:to:count: clipPolygonTopFrom:to:count:

	clipping utilitites
	backClipValueFrom:to: bottomClipValueFrom:to: frontClipValueFrom:to: interpolateFrom:to:at: leftClipValueFrom:to: rightClipValueFrom:to: topClipValueFrom:to:

	private
	primNextClippedQuadAfter:vertices:count:indexes:count: primNextClippedTriangleAfter:vertices:count:indexes:count:

	processing
	postProcessVertexBuffer: preProcessVertexBuffer: processIndexedLines: processIndexedQuads: processIndexedTriangles: processLineLoop: processLines: processPoints: processPolygon: processVertexBuffer:

	testing
	isAvailable

	clip flags	top
	clipFlagsX:y:z:w: Determine the clip flags for the given vector. The clip flags are a combination of inside and outside flags that can be used to easily reject an entire buffer if it is completely inside or outside and can also be used to detect the most commen cases in clipping (e.g., intersection with one boundary only).
	determineClipFlags:count: Determine the clip flags for all the vertices in the vertex array

	clipping polygons	top
	clipPolygon:count:with:mask: Clip the polygon defined by vtxCount vertices in vtxArray. tempVtxArray is a temporary storage area used for copying the vertices back and forth during clipping operation. outMask is the full clip mask of the vertex buffer, allowing some optimizations of the clipping code. NOTE: It is significant here that the contents of vtxArray and tempVtxArray are equal.
	clipPolygonBackFrom:to:count:
	clipPolygonBottomFrom:to:count:
	clipPolygonFrontFrom:to:count:
	clipPolygonLeftFrom:to:count:
	clipPolygonRightFrom:to:count:
	clipPolygonTopFrom:to:count:

	clipping utilitites	top
	backClipValueFrom:to:
	bottomClipValueFrom:to:
	frontClipValueFrom:to:
	interpolateFrom:to:at: Interpolate the primitive vertices last/next at the parameter t
	leftClipValueFrom:to:
	rightClipValueFrom:to:
	topClipValueFrom:to:

	private	top
	primNextClippedQuadAfter:vertices:count:indexes:count: Find the next partially clipped quad from the vertex buffer and return its index. If there are no more partially clipped quads return zero.
	primNextClippedTriangleAfter:vertices:count:indexes:count: Find the next partially clipped triangle from the vertex buffer and return its index. If there are no more partially clipped triangles return zero.

	processing	top
	postProcessVertexBuffer: Clip individual items depending on the primitive type
	preProcessVertexBuffer: Clip the elements in the vertex buffer. Return true if all vertices are inside. Return false if all vertices are outside. If partial clipping occurs, return nil.
	processIndexedLines: Process an indexed line set
	processIndexedQuads: Clip an indexed quad set
	processIndexedTriangles: Clip an indexed triangle set
	processLineLoop: Process a closed line defined by the vertex buffer
	processLines: Process a series of lines defined by each two points the vertex buffer
	processPoints: Process a series of points defined by the vertex buffer
	processPolygon: Process a polygon from the vertex buffer that requires partial clipping
	processVertexBuffer: Clip the elements in the vertex buffer. Return true if all vertices are inside. Return false if all vertices are outside. If partial clipping occurs, return nil.

	class initialization	top
	initialize B3DClipper initialize

	testing	top
	isAvailable Return true if this part of the engine is available