private static void Draw(ParticleSystem component)
{
SceneObject so = component.SceneObject;
// Draw collision planes, if enabled
Gizmos.Color = Color.Yellow;
ParticleEvolver[] evolvers = component.Evolvers;
foreach (var entry in evolvers)
{
if (entry is ParticleCollisions collisions)
{
if (collisions.Options.mode == ParticleCollisionMode.Plane)
{
void DrawPlane(Vector3 position, Vector3 right, Vector3 up, Vector3 forward)
{
Vector3 topLeft = position - right + up;
Vector3 topRight = position + right + up;
Vector3 botLeft = position - right - up;
Vector3 botRight = position + right - up;
Gizmos.DrawLine(topLeft, topRight);
Gizmos.DrawLine(topRight, botRight);
Gizmos.DrawLine(botRight, botLeft);
Gizmos.DrawLine(botLeft, topLeft);
Gizmos.DrawLine(position, position + forward * 0.4f);
}
SceneObject[] planeObjects = collisions.PlaneObjects;
foreach (var planeSO in planeObjects)
{
Vector3 position = planeSO.Position;
Vector3 right = planeSO.Rotation.Rotate(Vector3.XAxis);
Vector3 up = planeSO.Rotation.Rotate(Vector3.YAxis);
Vector3 forward = planeSO.Forward;
DrawPlane(position, right, up, forward);
}
Plane[] planes = collisions.Planes;
foreach (var plane in planes)
{
Vector3 right, up;
Vector3.OrthogonalComplement(plane.normal, out right, out up);
DrawPlane(plane.normal * plane.d, right, up, plane.normal);
}
}
}
}
// Draw emitter shapes
Gizmos.Transform = Matrix4.TRS(so.Position, Quaternion.LookRotation(so.Rotation.Forward, so.Rotation.Up), Vector3.One);
Gizmos.Color = Color.Green;
ParticleEmitter[] emitters = component.Emitters;
foreach (var entry in emitters)
{
ParticleEmitterShape shape = entry?.Shape;
if (shape == null)
{
continue;
}
if (shape is ParticleEmitterBoxShape boxShape)
{
Gizmos.DrawWireCube(Vector3.Zero, boxShape.Options.extents);
}
else if (shape is ParticleEmitterSphereShape sphereShape)
{
ParticleSphereShapeOptions options = sphereShape.Options;
Gizmos.DrawWireSphere(Vector3.Zero, options.radius);
if (options.thickness > 0.0f)
{
float innerRadius = options.radius * (1.0f - MathEx.Clamp01(options.thickness));
if (options.thickness < 1.0f)
{
Gizmos.Color = Color.Green * new Color(0.5f, 0.5f, 0.5f);
Gizmos.DrawWireSphere(Vector3.Zero, innerRadius);
}
Gizmos.Color = Color.Green * new Color(0.25f, 0.25f, 0.25f);
Gizmos.DrawLine(Vector3.XAxis * innerRadius, Vector3.XAxis * options.radius);
Gizmos.DrawLine(-Vector3.XAxis * innerRadius, -Vector3.XAxis * options.radius);
Gizmos.DrawLine(Vector3.YAxis * innerRadius, Vector3.YAxis * options.radius);
Gizmos.DrawLine(-Vector3.YAxis * innerRadius, -Vector3.YAxis * options.radius);
Gizmos.DrawLine(Vector3.ZAxis * innerRadius, Vector3.ZAxis * options.radius);
Gizmos.DrawLine(-Vector3.ZAxis * innerRadius, -Vector3.ZAxis * options.radius);
}
}
else if (shape is ParticleEmitterHemisphereShape hemisphereShape)
{
ParticleHemisphereShapeOptions options = hemisphereShape.Options;
Gizmos.DrawWireHemisphere(Vector3.Zero, options.radius);
DrawArcWithThickness(Vector3.Zero, options.radius, new Degree(360.0f), options.thickness, Color.Green);
if (options.thickness > 0.0f)
{
float innerRadius = options.radius * (1.0f - MathEx.Clamp01(options.thickness));
if (options.thickness < 1.0f)
{
Gizmos.Color = Color.Green * new Color(0.5f, 0.5f, 0.5f);
Gizmos.DrawWireHemisphere(Vector3.Zero, innerRadius);
}
Gizmos.Color = Color.Green * new Color(0.25f, 0.25f, 0.25f);
Gizmos.DrawLine(Vector3.XAxis * innerRadius, Vector3.XAxis * options.radius);
Gizmos.DrawLine(-Vector3.XAxis * innerRadius, -Vector3.XAxis * options.radius);
Gizmos.DrawLine(Vector3.YAxis * innerRadius, Vector3.YAxis * options.radius);
Gizmos.DrawLine(-Vector3.YAxis * innerRadius, -Vector3.YAxis * options.radius);
Gizmos.DrawLine(Vector3.ZAxis * innerRadius, Vector3.ZAxis * options.radius);
}
}
else if (shape is ParticleEmitterCircleShape circleShape)
{
ParticleCircleShapeOptions options = circleShape.Options;
DrawArcWithThickness(Vector3.Zero, options.radius, options.arc, options.thickness, Color.Green);
}
else if (shape is ParticleEmitterLineShape lineShape)
{
float halfLength = lineShape.Options.length * 0.5f;
Gizmos.DrawLine(new Vector3(-halfLength, 0.0f, 0.0f), new Vector3(halfLength, 0.0f, 0.0f));
}
else if (shape is ParticleEmitterRectShape rectShape)
{
Vector2 extents = rectShape.Options.extents;
Vector3 right = new Vector3(extents.x, 0.0f, 0.0f);
Vector3 up = new Vector3(0.0f, extents.y, 0.0f);
Vector3 topLeft = -right + up;
Vector3 topRight = right + up;
Vector3 botLeft = -right - up;
Vector3 botRight = right - up;
Gizmos.DrawLine(topLeft, topRight);
Gizmos.DrawLine(topRight, botRight);
Gizmos.DrawLine(botRight, botLeft);
Gizmos.DrawLine(botLeft, topLeft);
}
else if (shape is ParticleEmitterConeShape coneShape)
{
ParticleConeShapeOptions options = coneShape.Options;
float topRadius = options.radius;
float baseRadius = options.length * MathEx.Tan(options.angle);
Radian arc = options.arc;
if (topRadius > 0.0f)
{
DrawArcWithThickness(Vector3.Zero, topRadius, arc, options.thickness, Color.Green);
}
DrawArcWithThickness(new Vector3(0.0f, 0.0f, -options.length), baseRadius, arc, options.thickness,
Color.Green);
Gizmos.Color = Color.Green;
DrawConeBorder(topRadius, baseRadius, arc, options.length);
if (options.thickness > 0.0f && options.thickness < 1.0f)
{
Gizmos.Color = Color.Green * new Color(0.5f, 0.5f, 0.5f);
DrawConeBorder(
topRadius * (1.0f - MathEx.Clamp01(options.thickness)),
baseRadius * (1.0f - MathEx.Clamp01(options.thickness)), arc, options.length);
}
}
else if (shape is ParticleEmitterStaticMeshShape staticMeshShape)
{
RRef <Mesh> mesh = staticMeshShape.Options.mesh;
if (mesh.IsLoaded)
{
Gizmos.DrawWireMesh(mesh.Value.MeshData);
}
}
else if (shape is ParticleEmitterSkinnedMeshShape skinnedMeshShape)
{
Renderable renderable = skinnedMeshShape.Options.renderable;
if (renderable != null)
{
RRef <Mesh> mesh = renderable.Mesh;
if (mesh.IsLoaded)
{
Gizmos.DrawWireMesh(mesh.Value.MeshData);
}
}
}
}
// Draw manual bounds
if (!component.Settings.UseAutomaticBounds)
{
Gizmos.Color = Color.LightGray;
AABox bounds = component.Settings.CustomBounds;
Gizmos.DrawWireCube(bounds.Center, bounds.Size * 0.5f);
}
}
private static void DrawIcon(ParticleSystem component)
{
Gizmos.DrawIcon(component.SceneObject.Position, EditorBuiltin.GetSceneViewIcon(SceneViewIcon.ParticleSystem), false);
}