135 lines
3.4 KiB
Text
135 lines
3.4 KiB
Text
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file heightfieldTesselator.I
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* @author jyelon
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* @date 2006-07-17
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*/
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/**
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*
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*/
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INLINE HeightfieldTesselator::
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HeightfieldTesselator(const std::string &name) : Namable(name) {
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_poly_count = 10000;
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_visibility_radius = 32768;
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_focal_x = 0;
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_focal_y = 0;
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_horizontal_scale = 1.0;
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_vertical_scale = 255.0;
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_max_triangles = 512;
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_radii_calculated = false;
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}
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/**
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*
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*/
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INLINE HeightfieldTesselator::
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~HeightfieldTesselator() {
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}
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/**
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* Returns a reference to the heightfield (a PNMImage) contained inside the
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* HeightfieldTesselator. You can use the reference to alter the heightfield.
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*/
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INLINE PNMImage &HeightfieldTesselator::
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heightfield() {
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return _heightfield;
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}
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/**
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* Loads the specified greyscale image file into the heightfield.
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*/
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INLINE bool HeightfieldTesselator::
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set_heightfield(const Filename &filename, PNMFileType *ftype) {
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_radii_calculated = false;
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return _heightfield.read(filename, ftype);
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}
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/**
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* Sets the polygon-count target. The tesselator usually manages to come
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* within about 20% of the target, plus or minus.
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*/
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INLINE void HeightfieldTesselator::
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set_poly_count(int n) {
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_radii_calculated = false;
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_poly_count = n;
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}
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/**
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* Sets the visibility radius. Polygons that are completely outside the
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* radius (relative to the focal point) are cropped away. The cropping is
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* imperfect (all approximations are conservative), so this should be used in
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* conjunction with a far clipping plane, fog, or some other visibility
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* limiting mechanism. The units are in pixels.
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*/
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INLINE void HeightfieldTesselator::
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set_visibility_radius(int radius) {
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_radii_calculated = false;
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if (radius < 1) radius = 1;
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if (radius > 32768) radius = 32768;
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_visibility_radius = radius;
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}
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/**
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* Sets the focal point. The tesselator generates high-resolution terrain
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* around the focal point, and progressively lower and lower resolution
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* terrain as you get farther away. The units are in pixels.
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*/
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INLINE void HeightfieldTesselator::
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set_focal_point(int x, int y) {
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_focal_x = x;
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_focal_y = y;
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}
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/**
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* Sets the horizontal scale. The default scale is 1.0, meaning that each
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* pixel in the heightfield is 1x1 panda units wide.
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*/
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INLINE void HeightfieldTesselator::
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set_horizontal_scale(double h) {
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_horizontal_scale = h;
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}
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/**
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* Sets the vertical scale. The default scale is 255.0, meaning that each as
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* the gray value ranges from (0-1), the elevation ranges from (0-255) feet.
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*/
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INLINE void HeightfieldTesselator::
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set_vertical_scale(double v) {
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_vertical_scale = v;
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}
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/**
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* Sets the max triangles per geom.
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*/
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INLINE void HeightfieldTesselator::
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set_max_triangles(int n) {
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_max_triangles = n;
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}
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/**
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* Returns true if the given square should be subdivided.
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*/
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INLINE bool HeightfieldTesselator::
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subdivide(int scale, int x, int y) {
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if (scale == 0) {
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return false;
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}
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// int size = 1<<scale; int hsize = size >> 1; int xcenter = x+hsize; int
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// ycenter = y+hsize;
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int deltax = x - _focal_x;
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int deltay = y - _focal_y;
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if (deltax < 0) deltax = -deltax;
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if (deltay < 0) deltay = -deltay;
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int dist = (deltax > deltay) ? deltax : deltay;
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if (dist < _radii[scale-1]) {
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return true;
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}
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return false;
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}
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