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RoughRavines: Added per-height radius modifier. Ledges!

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This commit is contained in:
madmaxoft 2014-07-27 16:05:45 +02:00
parent 472f70a676
commit 960ab982b9
1 changed files with 75 additions and 34 deletions
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61
src/Generating/RoughRavines.cpp
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@ -22,6 +22,7 @@ class cRoughRavine :
public:
cRoughRavine(int a_Seed, int a_Size, float a_CenterWidth, float a_Roughness, int a_GridX, int a_GridZ, int a_OriginX, int a_OriginZ) :
super(a_GridX, a_GridZ, a_OriginX, a_OriginZ),
m_Seed(a_Seed + 100),
m_Noise(a_Seed + 100),
m_Roughness(a_Roughness)
{
@ -41,6 +42,9 @@ public:
// Calculate the points in between, recursively:
SubdivideLine(0, Half);
SubdivideLine(Half, Max);
// Initialize the per-height radius modifiers:
InitPerHeightRadius(a_GridX, a_GridZ);
}
protected:
@ -63,6 +67,8 @@ protected:
};
typedef std::vector<sRavineDefPoint> sRavineDefPoints;
int m_Seed;
cNoise m_Noise;
int m_MaxSize;
@ -71,6 +77,9 @@ protected:
float m_Roughness;
/** Number to add to the radius based on the height. This creates the "ledges" in the ravine walls. */
float m_PerHeightRadius[cChunkDef::Height];
/** Recursively subdivides the line between the points of the specified index.
Sets the midpoint to the center of the line plus or minus a random offset, then calls itself for each half
@ -114,6 +123,29 @@ protected:
}
void InitPerHeightRadius(int a_GridX, int a_GridZ)
{
int h = 0;
while (h < cChunkDef::Height)
{
m_Noise.SetSeed(m_Seed + h);
int rnd = m_Noise.IntNoise2DInt(a_GridX, a_GridZ) / 13;
int NumBlocks = (rnd % 3) + 2;
rnd = rnd / 4;
float Val = (float)(rnd % 256) / 128 - 1; // Random float in range [-1, +1]
if (h + NumBlocks > cChunkDef::Height)
{
NumBlocks = cChunkDef::Height - h;
}
for (int i = 0; i < NumBlocks; i++)
{
m_PerHeightRadius[h + i] = Val;
}
h += NumBlocks;
}
}
virtual void DrawIntoChunk(cChunkDesc & a_ChunkDesc) override
{
int BlockStartX = a_ChunkDesc.GetChunkX() * cChunkDef::Width;
@ -123,18 +155,20 @@ protected:
for (sRavineDefPoints::const_iterator itr = m_DefPoints.begin(), end = m_DefPoints.end(); itr != end; ++itr)
{
if (
(ceilf (itr->m_X + itr->m_Radius) < BlockStartX) ||
(floorf(itr->m_X - itr->m_Radius) > BlockEndX) ||
(ceilf (itr->m_Z + itr->m_Radius) < BlockStartZ) ||
(floorf(itr->m_Z - itr->m_Radius) > BlockEndZ)
(ceilf (itr->m_X + itr->m_Radius + 2) < BlockStartX) ||
(floorf(itr->m_X - itr->m_Radius - 2) > BlockEndX) ||
(ceilf (itr->m_Z + itr->m_Radius + 2) < BlockStartZ) ||
(floorf(itr->m_Z - itr->m_Radius - 2) > BlockEndZ)
)
{
// Cannot intersect, bail out early
continue;
}
// Carve out a cylinder around the xz point, m_Radius in diameter, from Bottom to Top:
float RadiusSq = itr->m_Radius * itr->m_Radius; // instead of doing sqrt for each distance, we do sqr of the radius
// Carve out a cylinder around the xz point, up to (m_Radius + 2) in diameter, from Bottom to Top:
// On each height level, use m_PerHeightRadius[] to modify the actual radius used
// EnlargedRadiusSq is the square of the radius enlarged by the maximum m_PerHeightRadius offset - anything outside it will never be touched.
float RadiusSq = (itr->m_Radius + 2) * (itr->m_Radius + 2);
float DifX = BlockStartX - itr->m_X; // substitution for faster calc
float DifZ = BlockStartZ - itr->m_Z; // substitution for faster calc
for (int x = 0; x < cChunkDef::Width; x++) for (int z = 0; z < cChunkDef::Width; z++)
@ -147,12 +181,20 @@ protected:
}
#endif // _DEBUG
// If the column is outside the enlarged radius, bail out completely
float DistSq = (DifX + x) * (DifX + x) + (DifZ + z) * (DifZ + z);
if (DistSq <= RadiusSq)
if (DistSq > RadiusSq)
{
continue;
}
int Top = std::min((int)ceilf(itr->m_Top), +cChunkDef::Height);
for (int y = std::max((int)floorf(itr->m_Bottom), 1); y <= Top; y++)
{
if ((itr->m_Radius + m_PerHeightRadius[y]) * (itr->m_Radius + m_PerHeightRadius[y]) < DistSq)
{
continue;
}
switch (a_ChunkDesc.GetBlockType(x, y, z))
{
// Only carve out these specific block types
@ -175,9 +217,8 @@ protected:
break;
}
default: break;
}
}
}
} // switch (BlockType)
} // for y
} // for x, z - a_BlockTypes
} // for itr - m_Points[]
}