TKE_Heuristics
Opcode
ASCII |
H |
Hexadecimal |
48 |
Decimal |
72 |
Operands
Variable mask,
Variable value,
[Long related_limit],
[Long internal_limit],
[Byte details]
[Byte culling]
mask |
bitmask of options which are specified, Short,
if high bit set a second Short follows |
value |
bitmask of options which are set on, Short,
if high bit of mask set a second Short follows |
related_limit |
number of additional geometry entities to record which also satisfy selection criteria |
internal_limit |
number of geometry components within a selected entity (ie, faces and edges
within a shell) to record in addition to the "best" one |
details |
bitmask to clarify a couple of the options which aren't simply on/off |
culling |
bitmask of culling options |
Notes
Heuristics provide hints on how you may improve drawing speed. Some options may change the
appearance of the drawing, such as quick moves using Xor drawing mode or partial
erase leaving holes in the
drawing. For the specific definitions on what these
mean in HOOPS/3dGS please refer to the
Set_Heuristics specification in the 3dGS Reference Manual.
Mask/Value bits:
00000001 |
Hidden Surfaces |
00000002 |
Backplane Cull |
00000004 |
Polygon Handedness, details field will be present if on |
00000008 |
Quick Moves, details field will be present if on |
00000010 |
Partial Erase |
00000020 |
Memory Purge |
00000040 |
Related selection limit, related_limit field will be present if on |
00000080 |
Internal selection limit, internal_limit field will be present if on |
00000100 |
Clipping |
00000200 |
Transformations |
00000400 |
Intersecting Polygons |
00000800 |
Polygons Crossings |
00001000 |
Concave Polygons |
00002000 |
Incremental Updates |
00004000 |
Selection Sorting |
00008000 |
Extended mask/value size |
00010000 |
Culling |
Detail bits:
01 |
Polygons Handedness is left if set,
right otherwise |
02 |
Quick Moves is to use spriting if set,
Xor/overlay otherwise |
Culling bits:
01 |
View Frustum culling should be used |
|