public FFrustum(FPlane[] cameraPlanes)
{
if (cameraPlanes.Length != 6)
throw new ArgumentException("A frustum must be built from 6 planes!", "cameraPlanes");
m_planes = cameraPlanes;
}
/// <summary>
/// Determines if the ray intersects with the given plane.
/// </summary>
/// <param name="plane">Plane to check intersection with</param>
/// <returns></returns>
public bool IntersectsWith(FPlane plane, out float intersectDist)
{
float a = Vector3.Dot(Direction, plane.Normal);
float num = -Vector3.Dot(Origin, plane.Normal) - plane.Distance;
if (Math.Abs(a) < float.Epsilon)
{
intersectDist = 0f;
return false;
}
intersectDist = num / a;
return intersectDist > 0f;
}
/// <summary>
/// Determines if the ray intersects with the given plane.
/// </summary>
/// <param name="plane">Plane to check intersection with</param>
/// <returns></returns>
public bool IntersectsWith(FPlane plane, out float intersectDist)
{
float a = Vector3.Dot(Direction, plane.Normal);
float num = -Vector3.Dot(Origin, plane.Normal) - plane.Distance;
if (Math.Abs(a) < float.Epsilon)
{
intersectDist = 0f;
return(false);
}
intersectDist = num / a;
return(intersectDist > 0f);
}
private void PlanesFromPoints(Vector3[] points)
{
if (points.Length != 8)
throw new ArgumentException("A frustum must be built from the 8 corners of the frustum!", "points");
// Construct planes out of the given points.
m_planes = new FPlane[6];
m_planes[0] = new FPlane(points[0], points[2], points[4]); // Left
m_planes[1] = new FPlane(points[5], points[7], points[1]); // Right
m_planes[2] = new FPlane(points[0], points[4], points[1]); // Top
m_planes[3] = new FPlane(points[3], points[7], points[2]); // Down
m_planes[4] = new FPlane(points[1], points[3], points[0]); // Near
m_planes[5] = new FPlane(points[7], points[5], points[4]); // Far
}
private void PlanesFromPoints(Vector3[] points)
{
if (points.Length != 8)
throw new ArgumentException("A frustum must be built from the 8 corners of the frustum!", "points");
// Construct planes out of the given points.
m_planes = new FPlane[6];
m_planes[0] = new FPlane(points[0], points[2], points[4]); // Left
m_planes[1] = new FPlane(points[5], points[7], points[1]); // Right
m_planes[2] = new FPlane(points[0], points[4], points[1]); // Top
m_planes[3] = new FPlane(points[3], points[7], points[2]); // Down
m_planes[4] = new FPlane(points[1], points[3], points[0]); // Near
m_planes[5] = new FPlane(points[7], points[5], points[4]); // Far
}
public bool TransformFromInput(FRay ray, WSceneView view)
{
if (m_mode != FTransformMode.Translation)
{
WrapCursor();
}
// Store the cursor position in viewport coordinates.
Vector2 screenDimensions = App.GetScreenGeometry();
Vector2 cursorPos = App.GetCursorPosition();
Vector2 mouseCoords = new Vector2(((2f * cursorPos.X) / screenDimensions.X) - 1f, (1f - ((2f * cursorPos.Y) / screenDimensions.Y))); //[-1,1] range
bool shiftPressed = WInput.GetKey(Key.LeftShift) || WInput.GetKey(Key.RightShift);
if (m_mode == FTransformMode.Translation)
{
// Create a Translation Plane
Vector3 axisA, axisB;
if (GetNumSelectedAxes() == 1)
{
if (m_selectedAxes == FSelectedAxes.X)
{
axisB = Vector3.UnitX;
}
else if (m_selectedAxes == FSelectedAxes.Y)
{
axisB = Vector3.UnitY;
}
else
{
axisB = Vector3.UnitZ;
}
Vector3 dirToCamera = (m_position - view.GetCameraPos()).Normalized();
axisA = Vector3.Cross(axisB, dirToCamera);
}
else
{
axisA = ContainsAxis(m_selectedAxes, FSelectedAxes.X) ? Vector3.UnitX : Vector3.UnitZ;
axisB = ContainsAxis(m_selectedAxes, FSelectedAxes.Y) ? Vector3.UnitY : Vector3.UnitZ;
}
Vector3 planeNormal = Vector3.Cross(axisA, axisB).Normalized();
m_translationPlane = new FPlane(planeNormal, m_position);
float intersectDist;
if (m_translationPlane.RayIntersectsPlane(ray, out intersectDist))
{
Vector3 hitPos = ray.Origin + (ray.Direction * intersectDist);
Vector3 localDelta = Vector3.Transform(hitPos - m_position, m_rotation.Inverted());
// Calculate a new position
Vector3 newPos = m_position;
if (ContainsAxis(m_selectedAxes, FSelectedAxes.X))
{
newPos += Vector3.Transform(Vector3.UnitX, m_rotation) * localDelta.X;
}
if (ContainsAxis(m_selectedAxes, FSelectedAxes.Y))
{
newPos += Vector3.Transform(Vector3.UnitY, m_rotation) * localDelta.Y;
}
if (ContainsAxis(m_selectedAxes, FSelectedAxes.Z))
{
newPos += Vector3.Transform(Vector3.UnitZ, m_rotation) * localDelta.Z;
}
if (shiftPressed)
{
// Round to nearest 100 unit increment while shift is held down.
newPos.X = (float)Math.Round(newPos.X / 100f) * 100f;
newPos.Y = (float)Math.Round(newPos.Y / 100f) * 100f;
newPos.Z = (float)Math.Round(newPos.Z / 100f) * 100f;
}
// Check the new location to see if it's skyrocked off into the distance due to near-plane raytracing issues.
Vector3 newPosDirToCamera = (newPos - view.GetCameraPos()).Normalized();
float dot = Math.Abs(Vector3.Dot(planeNormal, newPosDirToCamera));
//Console.WriteLine("hitPos: {0} localOffset: {1} newPos: {2}, dotResult: {3}", hitPos, localOffset, newPos, dot);
if (dot < 0.02f)
{
return(false);
}
// This is used to set the offset to the gizmo the mouse cursor is from the origin of the gizmo on the first frame
// that you click on the gizmo.
if (!m_hasSetMouseOffset)
{
m_translateOffset = m_position - newPos;
m_deltaTranslation = Vector3.Zero;
m_hasSetMouseOffset = true;
return(false);
}
// Apply Translation
m_deltaTranslation = Vector3.Transform(newPos - m_position + m_translateOffset, m_rotation.Inverted());
if (!ContainsAxis(m_selectedAxes, FSelectedAxes.X))
{
m_deltaTranslation.X = 0f;
}
if (!ContainsAxis(m_selectedAxes, FSelectedAxes.Y))
{
m_deltaTranslation.Y = 0f;
}
if (!ContainsAxis(m_selectedAxes, FSelectedAxes.Z))
{
m_deltaTranslation.Z = 0f;
}
m_totalTranslation += m_deltaTranslation;
m_position += Vector3.Transform(m_deltaTranslation, m_rotation);
if (!m_hasTransformed && (m_deltaTranslation != Vector3.Zero))
{
m_hasTransformed = true;
}
return(m_hasTransformed);
}
else
{
// Our raycast missed the plane
m_deltaTranslation = Vector3.Zero;
return(false);
}
}
else if (m_mode == FTransformMode.Rotation)
{
Vector3 rotationAxis;
if (m_selectedAxes == FSelectedAxes.X)
{
rotationAxis = Vector3.UnitX;
}
else if (m_selectedAxes == FSelectedAxes.Y)
{
rotationAxis = Vector3.UnitY;
}
else
{
rotationAxis = Vector3.UnitZ;
}
// Convert these from [0-1] to [-1, 1] to match our mouse coords.
Vector2 lineOrigin = (view.UnprojectWorldToViewport(m_hitPoint) * 2) - Vector2.One;
Vector2 lineEnd = (view.UnprojectWorldToViewport(m_hitPoint + m_moveDir) * 2) - Vector2.One;
lineOrigin.Y = -lineOrigin.Y;
lineEnd.Y = -lineEnd.Y;
Vector2 lineDir = (lineEnd - lineOrigin).Normalized();
float rotAmount = Vector2.Dot(lineDir, mouseCoords + m_wrapOffset - lineOrigin) * 180f;
if (float.IsNaN(rotAmount))
{
Console.WriteLine("rotAmountNaN!");
return(false);
}
if (!m_hasSetMouseOffset)
{
m_rotateOffset = -rotAmount;
m_deltaRotation = Quaternion.Identity;
m_hasSetMouseOffset = true;
return(false);
}
// Apply Rotation
rotAmount += m_rotateOffset;
if (shiftPressed)
{
// Round to nearest 45 degree increment while shift is held down.
rotAmount = (float)Math.Round(rotAmount / 45f) * 45f;
}
Quaternion oldRot = m_currentRotation;
m_currentRotation = Quaternion.FromAxisAngle(rotationAxis, WMath.DegreesToRadians(rotAmount));
m_deltaRotation = m_currentRotation * oldRot.Inverted();
if (m_transformSpace == FTransformSpace.Local)
{
m_rotation *= m_deltaRotation;
}
// Add to Total Rotation recorded for UI.
if (m_selectedAxes == FSelectedAxes.X)
{
m_totalRotation.X = rotAmount;
}
else if (m_selectedAxes == FSelectedAxes.Y)
{
m_totalRotation.Y = rotAmount;
}
else
{
m_totalRotation.Z = rotAmount;
}
if (!m_hasTransformed && rotAmount != 0f)
{
m_hasTransformed = true;
}
return(m_hasTransformed);
}
else if (m_mode == FTransformMode.Scale)
{
// Create a line in screen space.
// Convert these from [0-1] to [-1, 1] to match our mouse coords.
Vector2 lineOrigin = (view.UnprojectWorldToViewport(m_position) * 2) - Vector2.One;
lineOrigin.Y = -lineOrigin.Y;
// Determine the appropriate world space directoin using the selected axes and then conver this for use with
// screen-space controlls. This has to be done every frame because the axes can be flipped while the gizmo
// is transforming, so we can't pre-calculate this.
Vector3 dirX = Vector3.Transform(mFlipScaleX ? -Vector3.UnitX : Vector3.UnitX, m_rotation);
Vector3 dirY = Vector3.Transform(mFlipScaleY ? -Vector3.UnitY : Vector3.UnitY, m_rotation);
Vector3 dirZ = Vector3.Transform(mFlipScaleZ ? -Vector3.UnitZ : Vector3.UnitZ, m_rotation);
Vector2 lineDir;
// If there is only one axis, then the world space direction is the selected axis.
if (GetNumSelectedAxes() == 1)
{
Vector3 worldDir;
if (ContainsAxis(m_selectedAxes, FSelectedAxes.X))
{
worldDir = dirX;
}
if (ContainsAxis(m_selectedAxes, FSelectedAxes.Y))
{
worldDir = dirY;
}
else
{
worldDir = dirZ;
}
Vector2 worldPoint = (view.UnprojectWorldToViewport(m_position + worldDir) * 2) - Vector2.One;
worldPoint.Y = -lineOrigin.Y;
lineDir = (worldPoint - lineOrigin).Normalized();
}
// If there's two axii selected, then convert both to screen space and average them out to get the line direction.
else if (GetNumSelectedAxes() == 2)
{
Vector3 axisA = ContainsAxis(m_selectedAxes, FSelectedAxes.X) ? dirX : dirY;
Vector3 axisB = ContainsAxis(m_selectedAxes, FSelectedAxes.Z) ? dirZ : dirY;
Vector2 screenA = (view.UnprojectWorldToViewport(m_position + axisA) * 2) - Vector2.One;
screenA.Y = -screenA.Y;
Vector2 screenB = (view.UnprojectWorldToViewport(m_position + axisB) * 2) - Vector2.One;
screenB.Y = -screenB.Y;
screenA = (screenA - lineOrigin).Normalized();
screenB = (screenB - lineOrigin).Normalized();
lineDir = ((screenA + screenB) / 2f).Normalized();
}
// There's three axis, just use up.
else
{
lineDir = Vector2.UnitY;
}
float scaleAmount = Vector2.Dot(lineDir, mouseCoords + m_wrapOffset - lineOrigin) * 5f;
if (shiftPressed)
{
// Round to nearest whole number scale while shift is held down.
scaleAmount = (float)Math.Round(scaleAmount);
}
// Set their initial offset if we haven't already
if (!m_hasSetMouseOffset)
{
m_scaleOffset = -scaleAmount;
m_deltaScale = Vector3.One;
m_hasSetMouseOffset = true;
return(false);
}
// Apply the scale
scaleAmount = scaleAmount + m_scaleOffset + 1f;
// A multiplier is applied to the scale amount if it's less than one to prevent it dropping into the negatives.
// ???
if (scaleAmount < 1f)
{
scaleAmount = 1f / (-(scaleAmount - 1f) + 1f);
}
Vector3 oldScale = m_totalScale;
m_totalScale = Vector3.One;
if (ContainsAxis(m_selectedAxes, FSelectedAxes.X))
{
m_totalScale.X = scaleAmount;
}
if (ContainsAxis(m_selectedAxes, FSelectedAxes.Y))
{
m_totalScale.Y = scaleAmount;
}
if (ContainsAxis(m_selectedAxes, FSelectedAxes.Z))
{
m_totalScale.Z = scaleAmount;
}
m_deltaScale = new Vector3(m_totalScale.X / oldScale.X, m_totalScale.Y / oldScale.Y, m_totalScale.Z / oldScale.Z);
if (!m_hasTransformed && (scaleAmount != 1f))
{
m_hasTransformed = true;
}
return(m_hasTransformed);
}
return(false);
}
