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/**
* @file lltreeparams.h
* @brief Implementation of the LLTreeParams class
*
* Copyright (c) 2001-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#ifndef LL_LLTREEPARAMS_H
#define LL_LLTREEPARAMS_H
/* for information about formulas associated with each type
* check the Weber + Penn paper
*/
enum EShapeRatio { SR_CONICAL, SR_SPHERICAL, SR_HEMISPHERICAL,
SR_CYLINDRICAL, SR_TAPERED_CYLINDRICAL, SR_FLAME,
SR_INVERSE_CONICAL, SR_TEND_FLAME, SR_ENVELOPE};
const U32 TREE_BLOCK_SIZE = 16;
const U8 MAX_NUM_LEVELS = 4;
class LLTreeParams
{
public:
LLTreeParams();
virtual ~LLTreeParams();
static F32 ShapeRatio(EShapeRatio shape, F32 ratio);
public:
// Variables with an asterick (*) cannot be modified without a re-instancing the
// trunk/branches
// Variables with an exclamation point (!) should probably not be modified outside and instead
// be tied directly to the species
// Variables with a tilde (~) should be tied to a range specified by the
// species type but still slightly controllable by the user
// GENERAL
//! determines length/radius of branches on tree -- ie: general 'shape'
EShapeRatio mShape;
//! number of recursive branch levels...limit to MAX_NUM_LEVELS
U8 mLevels;
//~ percentage of trunk at bottom without branches
F32 mBaseSize;
//~ the general scale + variance of tree
F32 mScale, mScaleV;
// general scale of tree
F32 mScale0, mScaleV0;
// LOBING
//*! number of peaks in the radial distance about the perimeter
U8 mLobes;
// even numbers = obvius symmetry ... use odd numbers
//*! magnitude of the variations as a fraction of the radius
F32 mLobeDepth;
// FLARE
//*! causes exponential expansion near base of trunk
F32 mFlare;
// scales radius base by min 1 to '1 + flare'
//*! percentage of the height of the trunk to flair -- likely less than baseSize
F32 mFlarePercentage;
//*! number of cross sections to make for the flair
U8 mFlareRes;
// LEAVES
//~ number of leaves to make
U8 mLeaves;
//! scale of the leaves
F32 mLeafScaleX, mLeafScaleY;
// quality/density of leaves
F32 mLeafQuality;
// several params don't have level 0 values
// BRANCHES
//~ angle away from parent
F32 mDownAngle[MAX_NUM_LEVELS - 1];
F32 mDownAngleV[MAX_NUM_LEVELS - 1];
//~ rotation around parent
F32 mRotate[MAX_NUM_LEVELS - 1];
F32 mRotateV[MAX_NUM_LEVELS - 1];
//~ num branches to spawn
U8 mBranches[MAX_NUM_LEVELS - 1];
//~ fractional length of branch. 1 = same length as parent branch
F32 mLength[MAX_NUM_LEVELS];
F32 mLengthV[MAX_NUM_LEVELS];
//!~ ratio and ratiopower determine radius/length
F32 mRatio, mRatioPower;
//*! taper of branches
F32 mTaper[MAX_NUM_LEVELS];
// 0 - non-tapering cylinder
// 1 - taper to a point
// 2 - taper to a spherical end
// 3 - periodic tapering (concatenated spheres)
//! SEG SPLITTING
U8 mBaseSplits; //! num segsplits at first curve cross section of trunk
F32 mSegSplits[MAX_NUM_LEVELS]; //~ splits per cross section. 1 = 1 split per section
F32 mSplitAngle[MAX_NUM_LEVELS]; //~ angle that splits go from parent (tempered by height)
F32 mSplitAngleV[MAX_NUM_LEVELS]; //~ variance of the splits
// CURVE
F32 mCurve[MAX_NUM_LEVELS]; //* general, 1-axis, overall curve of branch
F32 mCurveV[MAX_NUM_LEVELS]; //* curve variance at each cross section from general overall curve
U8 mCurveRes[MAX_NUM_LEVELS]; //* number of cross sections for curve
F32 mCurveBack[MAX_NUM_LEVELS]; //* curveback is amount branch curves back towards
// vertices per cross section
U8 mVertices[MAX_NUM_LEVELS];
// * no longer useful with pre-instanced branches
// specifies upward tendency of branches.
//F32 mAttractionUp;
// 1 = each branch will slightly go upwards by the end of the branch
// >1 = branches tend to go upwards earlier in their length
// pruning not implemented
// Prune parameters
//F32 mPruneRatio;
//F32 mPruneWidth, mPruneWidthPeak;
//F32 mPrunePowerLow, mPrunePowerHigh;
// NETWORK MESSAGE DATA
// Below is the outline for network messages regarding trees.
// The general idea is that a user would pick a general 'tree type' (the first variable)
// and then several 'open ended' variables like 'branchiness' and 'leafiness'.
// The effect that each of these general user variables would then affect the actual
// tree parameters (like # branches, # segsplits) in different ways depending on
// the tree type selected. Essentially, each tree type should have a formula
// that expands the 'leafiness' and 'branchiness' user variables into actual
// values for the tree parameters.
// These formulas aren't made yet and will certainly require some tuning. The
// estimates below for the # bits required seems like a good guesstimate.
// VARIABLE - # bits (range) - VARIABLES AFFECTED
// tree type - 5 bits (32) -
// branches - 6 bits (64) - numBranches
// splits - 6 bits (64) - segsplits
// leafiness - 3 bits (8) - numLeaves
// branch spread - 5 bits (32) - splitAngle(V), rotate(V)
// angle - 5 bits (32) - downAngle(V)
// branch length - 6 bits (64) - branchlength(V)
// randomness - 7 bits (128) - percentage for randomness of the (V)'s
// basesize - 5 bits (32) - basesize
// total - 48 bits
//U8 mNetSpecies;
};
#endif
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