static float CalculateWorldUnitScreenSize(Camera camera, float worldUnits)
{
EditorHelper.SceneViewCamera cameraOrientation = EditorHelper.GetSceneViewCamera(camera);
bool orthographicAxisAligned = camera.orthographic && cameraOrientation != EditorHelper.SceneViewCamera.Other;
Transform transform = camera.transform;
if (orthographicAxisAligned)
{
float cameraHeight = camera.orthographicSize * 2;
float cameraWidth = camera.aspect * cameraHeight;
return(worldUnits * (float)Screen.width / cameraWidth);
}
else
{
float distanceFromGrid = Mathf.Abs(transform.position.y);
if (distanceFromGrid < 1)
{
distanceFromGrid = 1;
}
Vector3 worldCenter = transform.position + transform.forward * distanceFromGrid;
Vector3 rightVector = transform.right;
Vector3 worldPoint1 = worldCenter - rightVector * worldUnits * 0.5f;
Vector3 worldPoint2 = worldCenter + rightVector * worldUnits * 0.5f;
Vector3 screenPoint1 = camera.WorldToScreenPoint(worldPoint1);
Vector3 screenPoint2 = camera.WorldToScreenPoint(worldPoint2);
return(screenPoint2.x - screenPoint1.x);
}
}
private static void Draw()
{
SceneView sceneView = SceneView.currentDrawingSceneView;
// If the user has turned on hiding of perspectve grid then hide it if perspective
if (!sceneView.orthographic && CurrentSettings.HideGridInPerspective)
{
return;
}
// Cache additional references
Camera camera = sceneView.camera;
Transform transform = camera.transform;
float fullSnapDistance = CurrentSettings.PositionSnapDistance;
float snapDistance = fullSnapDistance;
// Calculate various camera positions and its orientation
EditorHelper.SceneViewCamera cameraOrientation = EditorHelper.GetSceneViewCamera(sceneView);
// True if the camera is both orthographic (iso) and axis-aligned
bool orthographicAxisAligned = sceneView.orthographic && cameraOrientation != EditorHelper.SceneViewCamera.Other;
Vector3 cameraPosition = transform.position;
Vector3 roundedCameraPosition = MathHelper.RoundVector3(cameraPosition, snapDistance);
// Calculate the world vectors to use for the X and Y grid axes
Vector3 xDirection = orthographicAxisAligned ? transform.right : Vector3.right;
Vector3 yDirection = orthographicAxisAligned ? transform.up : Vector3.forward;
// Now calculate a depth offset to help with dealing with objects far from the origin
Vector3 depthOffset = Vector3.zero;
if (orthographicAxisAligned)
{
float depthFudge = 1;
depthOffset = transform.forward * (camera.nearClipPlane + depthFudge + Vector3.Dot(cameraPosition, transform.forward));
// Debug.Log(camera.nearClipPlane + " to " + camera.farClipPlane);
// Debug.Log(depthOffset);
}
else
{
depthOffset = Vector3.zero;
}
// Line colors
Color normalLine = new Color32(200, 200, 200, 128);
Color smallestLine = new Color32(50, 50, 50, 128);
Color xAxisColor = ColorForVector(xDirection);
Color yAxisColor = ColorForVector(yDirection);
// How many lines to draw in each axis
int xCount;
int yCount;
// Center point of the grid in each axis
int xMid;
int yMid;
bool scaledUp = false;
// Width of one world unit in screen pixels
float gridWidthPixels = CalculateWorldUnitScreenSize(camera, 1);
if (snapDistance >= 8)
{
gridWidthPixels = CalculateWorldUnitScreenSize(camera, snapDistance);
}
if (gridWidthPixels < MIN_VISIBLE)
{
if (snapDistance > 8)
{
snapDistance = Mathf.Pow(Mathf.Floor(Mathf.Log(snapDistance, 8)), 8);
gridWidthPixels = CalculateWorldUnitScreenSize(camera, snapDistance);
}
while (gridWidthPixels < MIN_VISIBLE)
{
if (snapDistance < 8)
{
snapDistance = 8;
}
else
{
snapDistance *= 8;
}
scaledUp = true;
gridWidthPixels = CalculateWorldUnitScreenSize(camera, snapDistance);
}
}
// Alpha of the granular lines, generally based on distance
float minorLineAlphaMultiplier = Mathf.InverseLerp(MIN_VISIBLE, MAX_VISIBLE, gridWidthPixels);
float sanityScalar = Mathf.Max(1, snapDistance) * Mathf.Lerp(2, 1, minorLineAlphaMultiplier);
if (orthographicAxisAligned)
{
float cameraHeight = camera.orthographicSize * 2;
float cameraWidth = camera.aspect * cameraHeight;
xCount = Mathf.CeilToInt(cameraWidth / snapDistance);
yCount = Mathf.CeilToInt(cameraHeight / snapDistance);
xMid = (int)(Vector3.Dot(roundedCameraPosition, xDirection) / snapDistance);
yMid = (int)(Vector3.Dot(roundedCameraPosition, yDirection) / snapDistance);
}
else
{
List <Vector3> pointsInGrid = GetGridMinMax(camera);
Vector3 pivotPointOnGrid = sceneView.pivot;
pivotPointOnGrid.y = 0;
pointsInGrid.Add(pivotPointOnGrid);
Vector3 min = pointsInGrid[0];
Vector3 max = pointsInGrid[0];
// Calculate min,max
for (int i = 1; i < pointsInGrid.Count; i++)
{
min.x = Mathf.Min(pointsInGrid[i].x, min.x);
min.z = Mathf.Min(pointsInGrid[i].z, min.z);
max.x = Mathf.Max(pointsInGrid[i].x, max.x);
max.z = Mathf.Max(pointsInGrid[i].z, max.z);
}
// Ensure the grid isn't crazily big
min.x = Mathf.Max(min.x, pivotPointOnGrid.x - MAJOR_LINE_DISTANCE * sanityScalar);
min.z = Mathf.Max(min.z, pivotPointOnGrid.z - MAJOR_LINE_DISTANCE * sanityScalar);
max.x = Mathf.Min(max.x, pivotPointOnGrid.x + MAJOR_LINE_DISTANCE * sanityScalar);
max.z = Mathf.Min(max.z, pivotPointOnGrid.z + MAJOR_LINE_DISTANCE * sanityScalar);
// Now calculate grid line count
xCount = Mathf.CeilToInt((max.x - min.x) / snapDistance);
yCount = Mathf.CeilToInt((max.z - min.z) / snapDistance);
xMid = Mathf.RoundToInt((min.x + max.x) / 2f / snapDistance);
yMid = Mathf.RoundToInt((min.z + max.z) / 2f / snapDistance);
}
// Pad out the edge case
xCount += 2;
yCount += 2;
int xStart = xMid - xCount / 2;
int yStart = yMid - yCount / 2;
int xEnd = xMid + xCount / 2;
int yEnd = yMid + yCount / 2;
Vector3 cameraPositionOnPlane = new Vector3(transform.position.x, 0, transform.position.z);
// Start rendering
SabreGraphics.GetSelectedBrushMaterial().SetPass(0);
GL.Begin(GL.LINES);
int lineDistributonWorld = 8;
while (lineDistributonWorld <= snapDistance)
{
lineDistributonWorld *= 8;
}
// Calculate repetition count of the distribution lines
int lineDistributionCount;
if (snapDistance < lineDistributonWorld)
{
lineDistributionCount = (int)(lineDistributonWorld / snapDistance);
}
else
{
lineDistributionCount = 1;
}
int gridJump = 8;
// Ensure we don't split grid lines at too high a density when drawing as that would kill performance
if (snapDistance < 1)
{
gridJump = Mathf.RoundToInt(gridJump / snapDistance);
}
for (int y = yStart; y <= yEnd; y++)
{
Color sourceColor = normalLine;
bool majorLine = true;
if (y == 0)
{
sourceColor = xAxisColor;
}
else if (y % lineDistributionCount != 0)
{
majorLine = false;
if (!scaledUp)
{
sourceColor = smallestLine;
}
sourceColor.a *= minorLineAlphaMultiplier * 0.6f;
}
float activeDistance = sanityScalar * (majorLine ? MAJOR_LINE_DISTANCE : MINOR_LINE_DISTANCE);
for (int x = xStart; x < xEnd; x += gridJump)
{
Color color = sourceColor;
Vector3 yOffset = y * yDirection * snapDistance;
Vector3 center = depthOffset + yOffset;
Vector3 testPoint = center + xDirection * (x + gridJump / 2f) * snapDistance;
testPoint.y = 0;
float squareDistance = (testPoint - cameraPositionOnPlane).sqrMagnitude;
if (squareDistance > (activeDistance * activeDistance))
{
continue;
}
float distance = Mathf.Sqrt(squareDistance);
color.a *= Mathf.InverseLerp(activeDistance, activeDistance / 2f, distance);
GL.Color(color);
GL.Vertex(center + xDirection * (x + 0) * snapDistance);
GL.Vertex(center + xDirection * (x + gridJump) * snapDistance);
}
}
for (int x = xStart; x <= xEnd; x++)
{
Color sourceColor = normalLine;
bool majorLine = true;
if (x == 0)
{
sourceColor = yAxisColor;
}
else if (x % lineDistributionCount != 0)
{
majorLine = false;
if (!scaledUp)
{
sourceColor = smallestLine;
}
sourceColor.a *= minorLineAlphaMultiplier * 0.6f;
}
float activeDistance = sanityScalar * (majorLine ? MAJOR_LINE_DISTANCE : MINOR_LINE_DISTANCE);
for (int y = yStart; y < yEnd; y += gridJump)
{
Color color = sourceColor;
Vector3 xOffset = x * xDirection * snapDistance;
Vector3 center = depthOffset + xOffset;
Vector3 testPoint = center + yDirection * (y + gridJump / 2f) * snapDistance;
testPoint.y = 0;
float squareDistance = (testPoint - cameraPositionOnPlane).sqrMagnitude;
if (squareDistance > (activeDistance * activeDistance))
{
continue;
}
float distance = Mathf.Sqrt(squareDistance);
color.a *= Mathf.InverseLerp(activeDistance, activeDistance * 0.5f, distance);
GL.Color(color);
GL.Vertex(center + yDirection * (y + 0) * snapDistance);
GL.Vertex(center + yDirection * (y + gridJump) * snapDistance);
}
}
GL.End();
}
