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Howto:Animate models: Difference between revisions
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rewrite the 2020.4 axis animation object explanation because my last attempt was terrible.
m (documented 2020.4 tags for axis objects) |
m (rewrite the 2020.4 axis animation object explanation because my last attempt was terrible.) |
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If the <code><axis>...</axis></code> section is omitted entirely, <code>{object-name}-axis</code> will be used by default, where <code>{object-name}</code> is the name of the object being animated (if we are animating more than one object, the first object is used). In the earlier example this would be <code>Rudder-axis</code>. | If the <code><axis>...</axis></code> section is omitted entirely, <code>{object-name}-axis</code> will be used by default, where <code>{object-name}</code> is the name of the object being animated (if we are animating more than one object, the first object is used). In the earlier example this would be <code>Rudder-axis</code>. | ||
With FG <= 2023.3 the order of the points in the vertex will be sorted based on their X coordinate and when the X coordinate is equal the order will be that of the vertices in the model. | ==== Vertex Ordering ==== | ||
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With FG <= 2023.3 the order of the points in the vertex will be sorted based on their X coordinate and when the X coordinate is equal the order will be that of the vertices in the model. | |||
This has been improved in 2020.4 by adding some new tags that can be used in the <axis> section. | |||
# <order-by-xyz/> - use the new sorting rules | |||
# <order-by-x/> - use the 2020.3 sorting rules | |||
# <swap-axis-direction/> - when the animation goes the wrong way this is an elegant way to fix it. | |||
There is also a new top level tag <defaults> that can have either <axis-animation-vertex-order-xyz/> or <axis-animation-vertex-order-x/>. These defaults will affect all animations in the .xml and also any included models unless the included model also has a <defaults> section. | |||
So for modelers that want to use the new definitive vertex sorting rules adding the following to the main model is sufficient. | |||
<source> | |||
<defaults> | |||
<axis-animation-vertex-order-xyz/> | |||
</defaults> | |||
</source> | |||
==== Adding the axis animation 3d object to a model ==== | |||
In the '''.ac''' file, specify a SURF with type (bottom 4 bits, 0=polygon, 1=closedline, 2=line) set to 2, and two vertices that define the axis. For example: | In the '''.ac''' file, specify a SURF with type (bottom 4 bits, 0=polygon, 1=closedline, 2=line) set to 2, and two vertices that define the axis. For example: | ||