Skip to main content
Amateur Radio

Return to Answer

added 21 characters in body
Source Link
hobbs - KC2G
hobbs - KC2G
  • 13.2k
  • 18
  • 35

I'm pretty sure that what happens is that the GS card operates on everything above it and that they do "stack".

More specifically, whenever itNEC reads a GW (or other stuffanother card that defines wires like GH) it stores that geometry into an array in memory, and when it encounters a GS card it simply scales the coordinates of everything already in memory; thememory. The GS card is then "forgotten", so it doesn't have any effect on anything after it, and a later GS card doesn't care whether whether or not some geometry has been scaled by an earlier GS or not; if it has, it will get scaled again by the new one and their effects will multiply.

The GM card operates in a similar way. The difference with GM is that you can ask it to apply only to a subset of tag numbers — but it still only applies to what's above it, and the default is to apply to all tags. Cebik notes that relative ordering of GM and GS matters; if you have a GS that scales to feet with a GM above it, then the size of the GM transformation will be in feet (because the geometry will be unscaled when the GM gets to it, and then everything will get scaled down, including the transformation), but if you put the GS before the GM then the transformation will be in meters.

The main reason you don't see decks with more than one GS is because it's pretty confusing — having a single GS that defines "what your units are" and putting it at the end is by far the simplest thing.

I'm pretty sure that what happens is that the GS card operates on everything above it and that they do "stack".

More specifically, whenever it reads a GW (or other stuff like GH) it stores that geometry into an array in memory, and when it encounters a GS card it simply scales the coordinates of everything already in memory; the GS card is then "forgotten", so it doesn't have any effect on anything after it, and a later GS card doesn't care whether whether or not some geometry has been scaled by an earlier GS or not; if it has, it will get scaled again by the new one and their effects will multiply.

The GM card operates in a similar way. The difference with GM is that you can ask it to apply only to a subset of tag numbers — but it still only applies to what's above it. Cebik notes that relative ordering of GM and GS matters; if you have a GS that scales to feet with a GM above it, then the size of the GM transformation will be in feet (because the geometry will be unscaled when the GM gets to it, and then everything will get scaled down, including the transformation), but if you put the GS before the GM then the transformation will be in meters.

The main reason you don't see decks with more than one GS is because it's pretty confusing — having a single GS that defines "what your units are" and putting it at the end is by far the simplest thing.

I'm pretty sure that what happens is that the GS card operates on everything above it and that they do "stack".

More specifically, whenever NEC reads a GW (or another card that defines wires like GH) it stores that geometry into an array in memory, and when it encounters a GS card it simply scales the coordinates of everything already in memory. The GS card is then "forgotten", so it doesn't have any effect on anything after it, and a later GS card doesn't care whether whether or not some geometry has been scaled by an earlier GS or not; if it has, it will get scaled again by the new one and their effects will multiply.

The GM card operates in a similar way. The difference with GM is that you can ask it to apply only to a subset of tag numbers — but it still only applies to what's above it, and the default is to apply to all tags. Cebik notes that relative ordering of GM and GS matters; if you have a GS that scales to feet with a GM above it, then the size of the GM transformation will be in feet (because the geometry will be unscaled when the GM gets to it, and then everything will get scaled down, including the transformation), but if you put the GS before the GM then the transformation will be in meters.

The main reason you don't see decks with more than one GS is because it's pretty confusing — having a single GS that defines "what your units are" and putting it at the end is by far the simplest thing.

Source Link
hobbs - KC2G
hobbs - KC2G
  • 13.2k
  • 18
  • 35

I'm pretty sure that what happens is that the GS card operates on everything above it and that they do "stack".

More specifically, whenever it reads a GW (or other stuff like GH) it stores that geometry into an array in memory, and when it encounters a GS card it simply scales the coordinates of everything already in memory; the GS card is then "forgotten", so it doesn't have any effect on anything after it, and a later GS card doesn't care whether whether or not some geometry has been scaled by an earlier GS or not; if it has, it will get scaled again by the new one and their effects will multiply.

The GM card operates in a similar way. The difference with GM is that you can ask it to apply only to a subset of tag numbers — but it still only applies to what's above it. Cebik notes that relative ordering of GM and GS matters; if you have a GS that scales to feet with a GM above it, then the size of the GM transformation will be in feet (because the geometry will be unscaled when the GM gets to it, and then everything will get scaled down, including the transformation), but if you put the GS before the GM then the transformation will be in meters.

The main reason you don't see decks with more than one GS is because it's pretty confusing — having a single GS that defines "what your units are" and putting it at the end is by far the simplest thing.