private static bool PathHitsTerrain(NativeArray <TerrainSystem.AABB> blockBoxes, int2 terrainSize, float3 start,
float3 end, float paraA, float paraB, float paraC)
{
float distance = math.distance(end.xz, start.xz);
int steps = math.max(2, (int)math.ceil(distance / TerrainSystem.BOX_SPACING) + 1);
steps = (int)math.ceil(steps * COLLISION_STEP_MULTIPLIER);
for (int i = 0; i < steps; i++)
{
float t = i / (steps - 1f);
float3 pos = GetSimulatedPosition(start, end, paraA, paraB, paraC, t);
TerrainSystem.AABB box = new TerrainSystem.AABB
{
Min = pos - CANNONBALL_RADIUS,
Max = pos + CANNONBALL_RADIUS,
};
if (BoxHitsTerrain(blockBoxes, terrainSize, box))
{
return(true);
}
}
return(false);
}
static private bool BoxHitsTerrain(NativeArray <TerrainSystem.AABB> blockBoxes, int2 terrainSize,
TerrainSystem.AABB box)
{
// check nearby boxes -- TODO bias by half a box
int xMin = (int)math.floor((box.Min.x + 0.5f) / TerrainSystem.BOX_SPACING);
int xMax = (int)math.floor((box.Max.x + 0.5f) / TerrainSystem.BOX_SPACING);
int zMin = (int)math.floor((box.Min.z + 0.5f) / TerrainSystem.BOX_SPACING);
int zMax = (int)math.floor((box.Max.z + 0.5f) / TerrainSystem.BOX_SPACING);
xMin = math.max(0, xMin);
xMax = math.min(terrainSize.x - 1, xMax);
zMin = math.max(0, zMin);
zMax = math.min(terrainSize.y - 1, zMax);
for (int z = zMin; z <= zMax; z++)
{
for (int x = xMin; x <= xMax; x++)
{
int blockIndex = TerrainSystem.BlockCoordsToIndex(new int2(x, z), terrainSize);
TerrainSystem.AABB blockBox = blockBoxes[blockIndex];
bool intersects = !(box.Max.x <blockBox.Min.x || box.Min.x> blockBox.Max.x ||
box.Max.y <blockBox.Min.y || box.Min.y> blockBox.Max.y ||
box.Max.z <blockBox.Min.z || box.Min.z> blockBox.Max.z);
if (intersects)
{
return(true);
}
}
}
// TODO: check tanks
return(false);
}
