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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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4
servers/rendering/rendering_server_default.h
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@@ -726,6 +726,7 @@ public:
FUNC2(instance_set_exterior, RID, bool)
FUNC2(instance_set_extra_visibility_margin, RID, real_t)
FUNC2(instance_set_visibility_parent, RID, RID)
// don't use these in a game!
FUNC2RC(Vector<ObjectID>, instances_cull_aabb, const AABB &, RID)
@@ -736,8 +737,7 @@ public:
FUNC2(instance_geometry_set_cast_shadows_setting, RID, ShadowCastingSetting)
FUNC2(instance_geometry_set_material_override, RID, RID)
FUNC5(instance_geometry_set_draw_range, RID, float, float, float, float)
FUNC2(instance_geometry_set_as_instance_lod, RID, RID)
FUNC5(instance_geometry_set_visibility_range, RID, float, float, float, float)
FUNC4(instance_geometry_set_lightmap, RID, RID, const Rect2 &, int)
FUNC2(instance_geometry_set_lod_bias, RID, float)