public void Render_SystemCall(Camera renderCamera)
{
if (!Settings.IsVisible)
{
return;
}
if (IsRenderIgnoreCamera(renderCamera))
{
return;
}
AABB camViewVolumeAABB = renderCamera.CalculateVolumeAABB();
Vector3 gridPlanePos = WorldPlane.ProjectPoint(camViewVolumeAABB.Center);
Vector3 gridPlaneScale = camViewVolumeAABB.Size * 2.0f;
gridPlaneScale.y = 1.0f;
Matrix4x4 transformMatrix = Matrix4x4.TRS(gridPlanePos, Rotation, gridPlaneScale);
// Continue based on whether cell fading is used
if (LookAndFeel.UseCellFading)
{
// We will need to render the grid twice to simulate the grid effect which exists in Unity.
// When zooming out, it appears that smaller cells fade away while newer and bigger ones
// appear instead. We can do this by rendering the grid twice with different cell sizes and
// alpha values. The first step is to calculate the camera zoom (abs y position) and then
// count the number of digits in this value.
float cameraZoom = CalculateCellFadeZoom(renderCamera);
int numDigits = MathEx.GetNumDigits((int)cameraZoom);
// The number of digits inside the camera zoom can be used to calculate two power of 10 values.
// These values will be used to calculate 2 cell sizes: the small size which is fading out and
// the bigger size which is fading in.
// Example (assume XZ cell size of 1 and camera Y pos of 10.5)
// Zoom = 10 => NumDigits = 2;
// Power0 = 1; Power1 = 2;
// SmallCellSize = baseSize * 10 ^ Power0 = 10;
// BigCellSize = baseSize * 10 ^ Power1 = 100;
// So the cell size increases in powers of 10.
int csPower0 = numDigits - 1;
int csPower1 = csPower0 + 1;
// Calculate the cell size scale value based on the calculated powers of 10
float csScale0 = Mathf.Pow(10.0f, csPower0);
float csScale1 = Mathf.Pow(10.0f, csPower1);
// Calculate the alpha scale values. The first alpha scale value is used to fade out the small cells.
// The second alpha is used to fade in the bigger ones.
Color color = LookAndFeel.LineColor;
float alpha0 = (csScale1 - cameraZoom) / (csScale1 - csScale0);
float alpha1 = 1.0f - alpha0;
// Set material properties
Material material = MaterialPool.Get.XZGrid_Plane;
material.SetFloat("_CamFarPlaneDist", renderCamera.farClipPlane);
material.SetVector("_CamWorldPos", renderCamera.transform.position);
material.SetVector("_GridOrigin", Vector3.zero);
material.SetVector("_GridRight", Right);
material.SetVector("_GridLook", Look);
material.SetMatrix("_TransformMatrix", transformMatrix);
// Render in 2 passes to achieve the cell fade effect
color.a = LookAndFeel.LineColor.a * alpha0;
if (color.a != 0.0f)
{
// Set material properties for this pass
material.SetFloat("_CellSizeX", Settings.CellSizeX * csScale0);
material.SetFloat("_CellSizeZ", Settings.CellSizeZ * csScale0);
material.SetColor("_LineColor", color);
material.SetPass(0);
// Render
Graphics.DrawMeshNow(MeshPool.Get.UnitQuadXZ, transformMatrix);
}
color.a = LookAndFeel.LineColor.a * alpha1;
if (color.a != 0.0f)
{
// Set material properties for this pass
material.SetFloat("_CellSizeX", Settings.CellSizeX * csScale1);
material.SetFloat("_CellSizeZ", Settings.CellSizeZ * csScale1);
material.SetColor("_LineColor", color);
material.SetPass(0);
// Render
Graphics.DrawMeshNow(MeshPool.Get.UnitQuadXZ, transformMatrix);
}
}
else
{
// Just render the grid once with the chosen cell size
Material material = MaterialPool.Get.XZGrid_Plane;
material.SetFloat("_CamFarPlaneDist", renderCamera.farClipPlane);
material.SetVector("_CamWorldPos", renderCamera.transform.position);
material.SetMatrix("_TransformMatrix", transformMatrix);
material.SetFloat("_CellSizeX", Settings.CellSizeX);
material.SetFloat("_CellSizeZ", Settings.CellSizeZ);
material.SetColor("_LineColor", LookAndFeel.LineColor);
material.SetVector("_GridOrigin", Vector3.zero);
material.SetVector("_GridRight", Right);
material.SetVector("_GridLook", Look);
material.SetPass(0);
Graphics.DrawMeshNow(MeshPool.Get.UnitQuadXZ, transformMatrix);
}
}
