public static float Radius3DHandle(Quaternion rotation, Vector3 position, float radius, float minRadius = 0, float maxRadius = float.PositiveInfinity)
{
minRadius = Mathf.Abs(minRadius);
maxRadius = Mathf.Abs(maxRadius); if (maxRadius < minRadius)
{
maxRadius = minRadius;
}
const float kEpsilon = 0.000001F;
var camera = Camera.current;
var cameraLocalPos = SceneHandles.inverseMatrix.MultiplyPoint(camera.transform.position);
var cameraLocalForward = SceneHandles.inverseMatrix.MultiplyVector(camera.transform.forward);
var isCameraInsideSphere = (cameraLocalPos - position).magnitude < radius;
var isCameraOrthographic = camera.orthographic;
var isStatic = (!Tools.hidden && EditorApplication.isPlaying && GameObjectUtility.ContainsStatic(Selection.gameObjects));
var prevDisabled = SceneHandles.disabled;
var prevColor = SceneHandles.color;
var forward = rotation * Vector3.forward;
var up = rotation * Vector3.up;
var right = rotation * Vector3.right;
bool guiHasChanged = GUI.changed;
GUI.changed = false;
Vector3 positiveXDir = right;
Vector3 negativeXDir = -right;
Vector3 positiveYDir = up;
Vector3 negativeYDir = -up;
Vector3 positiveZDir = forward;
Vector3 negativeZDir = -forward;
Vector3 positiveXHandle = position + positiveXDir * radius;
Vector3 negativeXHandle = position + negativeXDir * radius;
Vector3 positiveYHandle = position + positiveYDir * radius;
Vector3 negativeYHandle = position + negativeYDir * radius;
Vector3 positiveZHandle = position + positiveZDir * radius;
Vector3 negativeZHandle = position + negativeZDir * radius;
bool positiveXBackfaced = false;
bool negativeXBackfaced = false;
bool positiveYBackfaced = false;
bool negativeYBackfaced = false;
bool positiveZBackfaced = false;
bool negativeZBackfaced = false;
if (!isCameraInsideSphere)
{
float cosV;
cosV = isCameraOrthographic ? Vector3.Dot(positiveXDir, -cameraLocalForward) :
Vector3.Dot(positiveXDir, (cameraLocalPos - positiveXHandle));
positiveXBackfaced = (cosV < -0.0001f);
cosV = isCameraOrthographic ? Vector3.Dot(negativeXDir, -cameraLocalForward) :
Vector3.Dot(negativeXDir, (cameraLocalPos - negativeXHandle));
negativeXBackfaced = (cosV < -0.0001f);
cosV = isCameraOrthographic ? Vector3.Dot(positiveYDir, -cameraLocalForward) :
Vector3.Dot(positiveYDir, (cameraLocalPos - positiveYHandle));
positiveYBackfaced = (cosV < -0.0001f);
cosV = isCameraOrthographic ? Vector3.Dot(negativeYDir, -cameraLocalForward) :
Vector3.Dot(negativeYDir, (cameraLocalPos - negativeYHandle));
negativeYBackfaced = (cosV < -0.0001f);
cosV = isCameraOrthographic ? Vector3.Dot(positiveZDir, -cameraLocalForward) :
Vector3.Dot(positiveZDir, (cameraLocalPos - positiveZHandle));
positiveZBackfaced = (cosV < -0.0001f);
cosV = isCameraOrthographic ? Vector3.Dot(negativeZDir, -cameraLocalForward) :
Vector3.Dot(negativeZDir, (cameraLocalPos - negativeZHandle));
negativeZBackfaced = (cosV < -0.0001f);
}
float positiveXSize = UnityEditor.HandleUtility.GetHandleSize(positiveXHandle) * 0.05f * (positiveXBackfaced ? backfaceSizeMultiplier : 1);
float negativeXSize = UnityEditor.HandleUtility.GetHandleSize(negativeXHandle) * 0.05f * (negativeXBackfaced ? backfaceSizeMultiplier : 1);
float positiveYSize = UnityEditor.HandleUtility.GetHandleSize(positiveYHandle) * 0.05f * (positiveYBackfaced ? backfaceSizeMultiplier : 1);
float negativeYSize = UnityEditor.HandleUtility.GetHandleSize(negativeYHandle) * 0.05f * (negativeYBackfaced ? backfaceSizeMultiplier : 1);
float positiveZSize = UnityEditor.HandleUtility.GetHandleSize(positiveZHandle) * 0.05f * (positiveZBackfaced ? backfaceSizeMultiplier : 1);
float negativeZSize = UnityEditor.HandleUtility.GetHandleSize(negativeZHandle) * 0.05f * (negativeZBackfaced ? backfaceSizeMultiplier : 1);
var isDisabled = isStatic || prevDisabled || Snapping.AxisLocking[0];
var color = SceneHandles.StateColor(prevColor, isDisabled, false);
var backfacedColor = SceneHandles.MultiplyTransparency(color, SceneHandles.backfaceAlphaMultiplier);
GUI.changed = false;
SceneHandles.color = positiveXBackfaced ? backfacedColor : color;
positiveXHandle = Slider2DHandle(positiveXHandle, Vector3.zero, forward, up, right, positiveXSize, OutlinedDotHandleCap);
if (GUI.changed)
{
radius = Vector3.Dot(positiveXHandle - position, positiveXDir); guiHasChanged = true;
}
GUI.changed = false;
SceneHandles.color = negativeXBackfaced ? backfacedColor : color;
negativeXHandle = Slider2DHandle(negativeXHandle, Vector3.zero, forward, up, right, negativeXSize, OutlinedDotHandleCap);
if (GUI.changed)
{
radius = Vector3.Dot(negativeXHandle - position, negativeXDir); guiHasChanged = true;
}
isDisabled = isStatic || prevDisabled || Snapping.AxisLocking[1];
color = SceneHandles.StateColor(prevColor, isDisabled, false);
backfacedColor = SceneHandles.MultiplyTransparency(color, SceneHandles.backfaceAlphaMultiplier);
GUI.changed = false;
SceneHandles.color = positiveYBackfaced ? backfacedColor : color;
positiveYHandle = Slider2DHandle(positiveYHandle, Vector3.zero, forward, up, right, positiveYSize, OutlinedDotHandleCap);
if (GUI.changed)
{
radius = Vector3.Dot(positiveYHandle - position, positiveYDir); guiHasChanged = true;
}
GUI.changed = false;
SceneHandles.color = negativeYBackfaced ? backfacedColor : color;
negativeYHandle = Slider2DHandle(negativeYHandle, Vector3.zero, forward, up, right, negativeYSize, OutlinedDotHandleCap);
if (GUI.changed)
{
radius = Vector3.Dot(negativeYHandle - position, negativeYDir); guiHasChanged = true;
}
isDisabled = isStatic || prevDisabled || Snapping.AxisLocking[2];
color = SceneHandles.StateColor(prevColor, isDisabled, false);
backfacedColor = SceneHandles.MultiplyTransparency(color, SceneHandles.backfaceAlphaMultiplier);
GUI.changed = false;
SceneHandles.color = positiveZBackfaced ? backfacedColor : color;
positiveZHandle = Slider2DHandle(positiveZHandle, Vector3.zero, up, forward, right, positiveZSize, OutlinedDotHandleCap);
if (GUI.changed)
{
radius = Vector3.Dot(positiveZHandle - position, positiveZDir); guiHasChanged = true;
}
GUI.changed = false;
SceneHandles.color = negativeZBackfaced ? backfacedColor : color;
negativeZHandle = Slider2DHandle(negativeZHandle, Vector3.zero, up, forward, right, negativeZSize, OutlinedDotHandleCap);
if (GUI.changed)
{
radius = Vector3.Dot(negativeZHandle - position, negativeZDir); guiHasChanged = true;
}
radius = Mathf.Max(minRadius, Mathf.Min(Mathf.Abs(radius), maxRadius));
GUI.changed |= guiHasChanged;
if (radius > 0)
{
isDisabled = isStatic || prevDisabled || (Snapping.AxisLocking[0] && Snapping.AxisLocking[1]);
color = SceneHandles.StateColor(prevColor, isDisabled, false);
backfacedColor = SceneHandles.MultiplyTransparency(color, SceneHandles.backfaceAlphaMultiplier);
var discOrientations = new Vector3[]
{
rotation *Vector3.right,
rotation *Vector3.up,
rotation *Vector3.forward
};
var currentCamera = Camera.current;
var cameraTransform = currentCamera.transform;
if (currentCamera.orthographic)
{
var planeNormal = cameraTransform.forward;
SceneHandles.DrawWireDisc(position, planeNormal, radius);
planeNormal.Normalize();
for (int i = 0; i < 3; i++)
{
var discOrientation = discOrientations[i];
var discTangent = Vector3.Cross(discOrientation, planeNormal);
// we may have view dir locked to one axis
if (discTangent.sqrMagnitude > kEpsilon)
{
SceneHandles.color = color;
SceneHandles.DrawWireArc(position, discOrientation, discTangent, 180, radius);
SceneHandles.color = backfacedColor;
SceneHandles.DrawWireArc(position, discOrientation, discTangent, -180, radius);
}
}
}
else
{
// Since the geometry is transformed by Handles.matrix during rendering, we transform the camera position
// by the inverse matrix so that the two-shaded wireframe will have the proper orientation.
var invMatrix = SceneHandles.inverseMatrix;
var cameraCenter = cameraTransform.position;
var cameraToCenter = position - invMatrix.MultiplyPoint(cameraCenter); // vector from camera to center
var sqrDistCameraToCenter = cameraToCenter.sqrMagnitude;
var sqrRadius = radius * radius; // squared radius
var sqrOffset = sqrRadius * sqrRadius / sqrDistCameraToCenter; // squared distance from actual center to drawn disc center
var insideAmount = sqrOffset / sqrRadius;
if (insideAmount < 1)
{
if (Mathf.Abs(sqrDistCameraToCenter) < kEpsilon)
{
return(radius);
}
var horizonRadius = Mathf.Sqrt(sqrRadius - sqrOffset);
var horizonCenter = position - sqrRadius * cameraToCenter / sqrDistCameraToCenter;
SceneHandles.color = color;
SceneHandles.DrawWireDisc(horizonCenter, cameraToCenter, horizonRadius);
var planeNormal = cameraToCenter.normalized;
for (int i = 0; i < 3; i++)
{
var discOrientation = discOrientations[i];
var angleBetweenDiscAndNormal = Mathf.Acos(Vector3.Dot(discOrientation, planeNormal));
angleBetweenDiscAndNormal = (Mathf.PI * 0.5f) - Mathf.Min(angleBetweenDiscAndNormal, Mathf.PI - angleBetweenDiscAndNormal);
float f = Mathf.Tan(angleBetweenDiscAndNormal);
float g = Mathf.Sqrt(sqrOffset + f * f * sqrOffset) / radius;
if (g < 1)
{
var angleToHorizon = Mathf.Asin(g) * Mathf.Rad2Deg;
var discTangent = Vector3.Cross(discOrientation, planeNormal);
var vectorToPointOnHorizon = Quaternion.AngleAxis(angleToHorizon, discOrientation) * discTangent;
var horizonArcLength = (90 - angleToHorizon) * 2.0f;
SceneHandles.color = color;
SceneHandles.DrawWireArc(position, discOrientation, vectorToPointOnHorizon, horizonArcLength, radius);
SceneHandles.color = backfacedColor;
SceneHandles.DrawWireArc(position, discOrientation, vectorToPointOnHorizon, horizonArcLength - 360, radius);
}
else
{
SceneHandles.color = backfacedColor;
SceneHandles.DrawWireDisc(position, discOrientation, radius);
}
}
}
else
{
SceneHandles.color = backfacedColor;
for (int i = 0; i < 3; i++)
{
var discOrientation = discOrientations[i];
SceneHandles.DrawWireDisc(position, discOrientation, radius);
}
}
}
}
SceneHandles.disabled = prevDisabled;
SceneHandles.color = prevColor;
return(radius);
}
