private static void HitSpheres(float3 p, ref float curDist, ref float3 normal, ref Material mat)
{
float interval = 2f;
float3 pos = p + new float3(100f, 0f, 100f);
int2 period = new int2(
((int)(pos.x / interval)) % 7,
((int)(pos.z / interval)) % 17);
pos = SDF.ModXZ(pos, new float2(interval, interval)); // Todo: how to make consistent for negative quadrants?
/* Todo:
* doing the following makes the field discontinuous as the modular boundary is crossed
* float3 spherePos = new float3(0f, period % 2, 0f);
* need a different way of thinking about instance parameters in repeated space
*
* dont' calculate material/color/normal calculation until after hit is found
* do them in a separate function
*/
float3 spherePos = new float3(0f, 0f, 0f); // location in worldmodxspace
float sphereRad = 0.5f;
pos = pos - spherePos;
float dist = SDF.Sphere(pos, sphereRad);
if (dist < curDist)
{
curDist = dist;
normal = pos / sphereRad;
mat = new Material(MaterialType.Metal, new float3(period.x / 7f, 0.75f, period.y / 17f));
}
}
private static void HitSphere(float3 p, ref float curDist, ref float3 normal, ref Material mat)
{
float3 spherePos = new float3(0f, 21f, -40f);
float sphereRad = 20f;
float3 pos = p - spherePos;
float dist = SDF.Sphere(pos, sphereRad);
if (dist < curDist)
{
curDist = dist;
normal = pos / sphereRad;
mat = new Material(MaterialType.Metal, new float3(0.33f));
}
}