131 lines
3.0 KiB
C#
131 lines
3.0 KiB
C#
using Godot;
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using System.Collections;
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using System.Collections.Generic;
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using Godot.Collections;
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namespace Rokojori
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{
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[Tool]
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[GlobalClass]
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public partial class LODMultiMesh:MultiMeshInstance3D
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{
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[Export]
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public float minDistance = 0;
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[Export]
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public float cullDistance = 100;
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[Export]
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public Curve fillCurve = MathX.Curve( 0, 1 );
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float _distance = -10;
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[Export]
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public float distanceTreshold = 0.01f;
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[Export( PropertyHint.Range, "0,1" )]
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public float scaleRange = 0.5f;
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[Export]
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public float downMax = 0.1f;
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[Export]
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Vector3[] cachedOrigins = null;
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[Export]
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Vector3[] cachedBasis = null;
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public void CacheTransforms()
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{
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var mm = Multimesh;
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cachedOrigins = new Vector3[ mm.InstanceCount ];
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cachedBasis = new Vector3[ mm.InstanceCount * 3 ];
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for ( int i = 0; i < mm.InstanceCount; i++ )
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{
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var trsf = mm.GetInstanceTransform( i );
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cachedBasis[ i * 3 + 0 ] = trsf.Basis.Column0;
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cachedBasis[ i * 3 + 1 ] = trsf.Basis.Column1;
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cachedBasis[ i * 3 + 2 ] = trsf.Basis.Column2;
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cachedOrigins[ i ] =( trsf.Origin );
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}
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}
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public override void _Process(double delta)
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{
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var camera = GetViewport().GetCamera3D();
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#if TOOLS
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if ( Engine.IsEditorHint() )
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{
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camera = EditorInterface.Singleton.GetEditorViewport3D().GetCamera3D();
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}
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#endif
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var distance = ( camera.GlobalPosition - GlobalPosition ).Length();
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if ( Mathf.Abs( _distance - distance ) < distanceTreshold )
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{
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return;
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}
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_distance = distance;
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var mapped = MathX.RemapClamped( distance, minDistance, cullDistance, 1, 0 );
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var mm = Multimesh;
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// this.LogInfo( "MM", (int) distance, ( (int) ( 100 * mapped ) ) + "%", (int)( fillCurve.Sample( mapped ) * mm.InstanceCount) + " instances" );
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if ( mm == null )
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{
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return;
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}
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if ( distance >= cullDistance )
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{
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mm.VisibleInstanceCount = 0;
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return;
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}
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var count = Mathf.RoundToInt( fillCurve.Sample( mapped ) * mm.InstanceCount );
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count = Mathf.Clamp( count, 0, mm.InstanceCount );
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var fadeStart = count * ( 1 - scaleRange );
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for ( int i = 0; i < count; i++ )
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{
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var cbasis = new Basis( cachedBasis[ i * 3 + 0 ], cachedBasis[ i * 3 + 1 ], cachedBasis[ i * 3 + 2 ] );
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var trsf = new Transform3D( cbasis, cachedOrigins[ i ] );
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if ( i >= fadeStart )
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{
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var amount = MathX.RemapClamped( i, fadeStart, count, 0, 1 );
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var basis = trsf.Basis.Scaled( new Vector3( 1, Mathf.Max( ( 1f - amount ), 0.0001f ), 1 ));
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var offsetTrsf = new Transform3D( basis, trsf.Origin + downMax * Vector3.Down);
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mm.SetInstanceTransform( i, offsetTrsf );
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}
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else
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{
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mm.SetInstanceTransform( i, trsf );
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}
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}
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mm.VisibleInstanceCount = count;
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}
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}
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} |