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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_server.h
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@ -1172,6 +1172,7 @@ public:
virtual void instance_set_exterior(RID p_instance, bool p_enabled) = 0;
virtual void instance_set_extra_visibility_margin(RID p_instance, real_t p_margin) = 0;
virtual void instance_set_visibility_parent(RID p_instance, RID p_parent_instance) = 0;
// don't use these in a game!
virtual Vector<ObjectID> instances_cull_aabb(const AABB &p_aabb, RID p_scenario = RID()) const = 0;
@ -1201,8 +1202,7 @@ public:
virtual void instance_geometry_set_cast_shadows_setting(RID p_instance, ShadowCastingSetting p_shadow_casting_setting) = 0;
virtual void instance_geometry_set_material_override(RID p_instance, RID p_material) = 0;
virtual void instance_geometry_set_draw_range(RID p_instance, float p_min, float p_max, float p_min_margin, float p_max_margin) = 0;
virtual void instance_geometry_set_as_instance_lod(RID p_instance, RID p_as_lod_of_instance) = 0;
virtual void instance_geometry_set_visibility_range(RID p_instance, float p_min, float p_max, float p_min_margin, float p_max_margin) = 0;
virtual void instance_geometry_set_lightmap(RID p_instance, RID p_lightmap, const Rect2 &p_lightmap_uv_scale, int p_lightmap_slice) = 0;
virtual void instance_geometry_set_lod_bias(RID p_instance, float p_lod_bias) = 0;