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Implement visibility range and dependencies.

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This commit adds the following properties to GeometryInstance3D: `visibility_range_begin`,
`visibility_range_begin_margin`, `visibility_range_end`, `visibility_range_end_margin`.

Together they define a range in which the GeometryInstance3D will be visible from the camera,
taking hysteresis into account for state changes. A begin or end value of 0 will be ignored,
so the visibility range can be open-ended in both directions.

This commit also adds the `visibility_parent` property to 'Node3D'.
Which defines the visibility parents of the node and its subtree (until
another parent is defined).

Visual instances with a visibility parent will only be visible when the parent, and all of its
ancestors recursively, are hidden because they are closer to the camera than their respective
`visibility_range_begin` thresholds.

Combining visibility ranges and visibility parents users can set-up a quick HLOD system
that shows high detail meshes when close (i.e buildings, trees) and merged low detail meshes
for far away groups (i.e. cities, woods).
This commit is contained in:
jfons
2021-05-09 18:23:20 +02:00
parent 12e0f10c74
commit 3a53ae5d9f
15 changed files with 918 additions and 305 deletions
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28
doc/classes/GeometryInstance3D.xml
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@@ -52,26 +52,22 @@
</member>
<member name="lod_bias" type="float" setter="set_lod_bias" getter="get_lod_bias" default="1.0">
</member>
<member name="lod_max_distance" type="float" setter="set_lod_max_distance" getter="get_lod_max_distance" default="0.0">
The GeometryInstance3D's max LOD distance.
[b]Note:[/b] This property currently has no effect.
</member>
<member name="lod_max_hysteresis" type="float" setter="set_lod_max_hysteresis" getter="get_lod_max_hysteresis" default="0.0">
The GeometryInstance3D's max LOD margin.
[b]Note:[/b] This property currently has no effect.
</member>
<member name="lod_min_distance" type="float" setter="set_lod_min_distance" getter="get_lod_min_distance" default="0.0">
The GeometryInstance3D's min LOD distance.
[b]Note:[/b] This property currently has no effect.
</member>
<member name="lod_min_hysteresis" type="float" setter="set_lod_min_hysteresis" getter="get_lod_min_hysteresis" default="0.0">
The GeometryInstance3D's min LOD margin.
[b]Note:[/b] This property currently has no effect.
</member>
<member name="material_override" type="Material" setter="set_material_override" getter="get_material_override">
The material override for the whole geometry.
If a material is assigned to this property, it will be used instead of any material set in any material slot of the mesh.
</member>
<member name="visibility_range_begin" type="float" setter="set_visibility_range_begin" getter="get_visibility_range_begin" default="0.0">
Starting distance from which the GeometryInstance3D will be visible, taking [member visibility_range_begin_margin] into account as well. The default value of 0 is used to disable the range check.
</member>
<member name="visibility_range_begin_margin" type="float" setter="set_visibility_range_begin_margin" getter="get_visibility_range_begin_margin" default="0.0">
Margin for the [member visibility_range_begin] threshold. The GeometryInstance3D will only change its visibility state when it goes over or under the [member visibility_range_begin] threshold by this amount.
</member>
<member name="visibility_range_end" type="float" setter="set_visibility_range_end" getter="get_visibility_range_end" default="0.0">
Distance from which the GeometryInstance3D will be hidden, taking [member visibility_range_end_margin] into account as well. The default value of 0 is used to disable the range check..
</member>
<member name="visibility_range_end_margin" type="float" setter="set_visibility_range_end_margin" getter="get_visibility_range_end_margin" default="0.0">
Margin for the [member visibility_range_end] threshold. The GeometryInstance3D will only change its visibility state when it goes over or under the [member visibility_range_end] threshold by this amount.
</member>
</members>
<constants>
<constant name="SHADOW_CASTING_SETTING_OFF" value="0" enum="ShadowCastingSetting">