static float3 ComputeBlendSize(VolumeFalloff volumeFalloff)
{
float3 size = volumeFalloff.size;
float3 blendSize = (new float3(1.0f, 1.0f, 1.0f) - volumeFalloff.fadePositive - volumeFalloff.fadeNegative);
blendSize.x *= size.x;
blendSize.y *= size.y;
blendSize.z *= size.z;
return(blendSize);
}
static float3 ComputeCenterBlendLocalPosition(VolumeFalloff volumeFalloff)
{
float3 size = volumeFalloff.size;
float3 posBlend = volumeFalloff.fadePositive;
posBlend.x *= size.x;
posBlend.y *= size.y;
posBlend.z *= size.z;
float3 negBlend = volumeFalloff.fadeNegative;
negBlend.x *= size.x;
negBlend.y *= size.y;
negBlend.z *= size.z;
float3 localPosition = (negBlend - posBlend) * 0.5f;
return(localPosition);
}
static void DrawGizmosSelected(VolumeFalloff volumeFalloff, GizmoType gizmoType)
{
Matrix4x4 m = volumeFalloff.isTransformScaleUsed
? volumeFalloff.transform.localToWorldMatrix
: Matrix4x4.TRS(volumeFalloff.transform.position, volumeFalloff.transform.rotation, Vector3.one);
m = m * Matrix4x4.TRS(volumeFalloff.center, Quaternion.identity, Vector3.one);
using (new Handles.DrawingScope(m))
{
// Blend box
s_BlendBox.center = ComputeCenterBlendLocalPosition(volumeFalloff);
s_BlendBox.size = ComputeBlendSize(volumeFalloff);
Color baseColor = volumeFalloff.debugColor;
baseColor.a = 8.0f / 255.0f;
s_BlendBox.baseColor = baseColor;
s_BlendBox.DrawHull(editMode == VolumeFalloffEditMode.Falloff);
// Bounding box.
s_ShapeBox.center = new float3(0.0f, 0.0f, 0.0f);
s_ShapeBox.size = volumeFalloff.size;
s_ShapeBox.DrawHull(editMode == VolumeFalloffEditMode.Bounds);
}
}
void OnSceneGUI()
{
//Note: for each handle to be independent when multi-selecting VolumeFalloff,
//We cannot rely hereon VolumeFalloff which is the collection of
//selected VolumeFalloff. Thus code is almost the same of the UI.
VolumeFalloff volumeFalloff = target as VolumeFalloff;
Matrix4x4 m = volumeFalloff.isTransformScaleUsed
? volumeFalloff.transform.localToWorldMatrix
: Matrix4x4.TRS(volumeFalloff.transform.position, volumeFalloff.transform.rotation, Vector3.one);
m = m * Matrix4x4.TRS(volumeFalloff.center, Quaternion.identity, Vector3.one);
switch (editMode)
{
case VolumeFalloffEditMode.Falloff:
using (new Handles.DrawingScope(m))
{
//contained must be initialized in all case
s_ShapeBox.center = float3.zero;
s_ShapeBox.size = volumeFalloff.size;
Color baseColor = volumeFalloff.debugColor;
baseColor.a = 8.0f / 255.0f;
s_BlendBox.baseColor = baseColor;
s_BlendBox.monoHandle = false; //!volumeFalloff.m_EditorAdvancedFade;
s_BlendBox.center = ComputeCenterBlendLocalPosition(volumeFalloff);
s_BlendBox.size = ComputeBlendSize(volumeFalloff);
EditorGUI.BeginChangeCheck();
s_BlendBox.DrawHandle();
if (EditorGUI.EndChangeCheck())
{
Undo.RecordObject(volumeFalloff, "Change Volume Falloff Falloff Region");
//work in local space to compute the change on fadePositive and fadeNegative
float3 newCenterBlendLocalPosition = s_BlendBox.center;
float3 halfSize = s_BlendBox.size * 0.5f;
float3 size = volumeFalloff.size;
float3 posFade = newCenterBlendLocalPosition + halfSize;
posFade.x = 0.5f - posFade.x / size.x;
posFade.y = 0.5f - posFade.y / size.y;
posFade.z = 0.5f - posFade.z / size.z;
float3 negFade = newCenterBlendLocalPosition - halfSize;
negFade.x = 0.5f + negFade.x / size.x;
negFade.y = 0.5f + negFade.y / size.y;
negFade.z = 0.5f + negFade.z / size.z;
volumeFalloff.fadePositive = posFade;
volumeFalloff.fadeNegative = negFade;
}
}
break;
case VolumeFalloffEditMode.Bounds:
//important: if the origin of the handle's space move along the handle,
//handles displacement will appears as moving two time faster.
using (new Handles.DrawingScope(m))
{
//contained must be initialized in all case
s_ShapeBox.center = float3.zero;
s_ShapeBox.size = volumeFalloff.size;
float3 previousSize = volumeFalloff.size;
float3 previousPositiveFade = volumeFalloff.fadePositive;
float3 previousNegativeFade = volumeFalloff.fadeNegative;
EditorGUI.BeginChangeCheck();
s_ShapeBox.DrawHandle();
if (EditorGUI.EndChangeCheck())
{
Undo.RecordObjects(new Object[] { volumeFalloff, volumeFalloff.transform }, "Change Volume Falloff Bounds");
float3 newSize = s_ShapeBox.size;
volumeFalloff.size = newSize;
float3 newPositiveFade = new float3(
newSize.x < 0.00001 ? 0.0f : previousPositiveFade.x * previousSize.x / newSize.x,
newSize.y < 0.00001 ? 0.0f : previousPositiveFade.y * previousSize.y / newSize.y,
newSize.z < 0.00001 ? 0.0f : previousPositiveFade.z * previousSize.z / newSize.z
);
float3 newNegativeFade = new float3(
newSize.x < 0.00001 ? 0.0f : previousNegativeFade.x * previousSize.x / newSize.x,
newSize.y < 0.00001 ? 0.0f : previousNegativeFade.y * previousSize.y / newSize.y,
newSize.z < 0.00001 ? 0.0f : previousNegativeFade.z * previousSize.z / newSize.z
);
for (int axeIndex = 0; axeIndex < 3; ++axeIndex)
{
if (newPositiveFade[axeIndex] + newNegativeFade[axeIndex] > 1)
{
float overValue = (newPositiveFade[axeIndex] + newNegativeFade[axeIndex] - 1f) * 0.5f;
newPositiveFade[axeIndex] -= overValue;
newNegativeFade[axeIndex] -= overValue;
if (newPositiveFade[axeIndex] < 0)
{
newNegativeFade[axeIndex] += newPositiveFade[axeIndex];
newPositiveFade[axeIndex] = 0f;
}
if (newNegativeFade[axeIndex] < 0)
{
newPositiveFade[axeIndex] += newNegativeFade[axeIndex];
newNegativeFade[axeIndex] = 0f;
}
}
}
volumeFalloff.fadePositive = newPositiveFade;
volumeFalloff.fadeNegative = newNegativeFade;
volumeFalloff.center += (float3)s_ShapeBox.center;
}
}
break;
default: Debug.Assert(false, "VolumeFalloffEditor: Encountered unsupported edit mode."); break;
}
}
