private void CalculateRaysForOrthographic()
{
var aspectRatio = (float)width / height;
// In orthographic rendering direction is same for all rays.
var direction = transform.rotation * Vector3.forward;
for (int j = 0; j < height; j++)
{
for (int i = 0; i < width; i++)
{
// Firstly we transform from texture space into normalized texture space.
var pixelNormalizedX = ((i + 0.5f)) / width;
var pixelNormalizedY = ((j + 0.5f)) / height;
// Then we offset the space from [0:1] to [-1:1]
var pixelScreenX = pixelNormalizedX * 2 - 1;
var pixelScreenY = pixelNormalizedY * 2 - 1;
// Taking field of view into calculation and aspect ration in case screen is not uniform.
var pixelCameraX = pixelScreenX * aspectRatio * orthographicSize;
var pixelCameraY = pixelScreenY * orthographicSize;
var position = new Vector3(pixelCameraX, pixelCameraY, 0);
position += transform.position; // To world space.
var rayData = new RayCastingRayData();
rayData.position = position;
rayData.direction = direction;
rayDatas[j * width + i] = rayData;
}
}
}
private void CalculateRaysForPerspective()
{
// Calculate the field of view transformation.
// TODO: Cache.
var degress = fieldOfView * Mathf.Deg2Rad / 2;
var sizeOfOffset = Mathf.Tan(degress);
var aspectRatio = (float)Screen.width / Screen.height;
// In projection rendering position is same for all rays.
var position = transform.position;
for (int j = 0; j < height; j++)
{
for (int i = 0; i < width; i++)
{
// Firstly we transform from texture space into normalized texture space.
var pixelNormalizedX = ((i + 0.5f)) / width;
var pixelNormalizedY = ((j + 0.5f)) / height;
// Then we offset the space from [0:1] to [-1:1]
var pixelScreenX = pixelNormalizedX * 2 - 1;
var pixelScreenY = pixelNormalizedY * 2 - 1;
// Taking field of view into calculation and aspect ration in case screen is not uniform.
var pixelCameraX = pixelScreenX * sizeOfOffset * aspectRatio;
var pixelCameraY = pixelScreenY * sizeOfOffset;
var direction = new Vector3(pixelCameraX, pixelCameraY, 1);
direction = transform.rotation * direction.normalized; // To world space.
var rayData = new RayCastingRayData();
rayData.position = position;
rayData.direction = direction;
rayDatas[j * width + i] = rayData;
}
}
}
