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https://github.com/overte-org/overte.git
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fixed line spacing and added BoundingBox support
This commit is contained in:
ZappoMan
parent
6d3ec662a1
commit
b3ef9868e3
2 changed files with 157 additions and 138 deletions
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@ -1,87 +1,95 @@
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//
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// VoxelProjectedShadow.cpp - The projected shadow (on the 2D view plane) for a voxel
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// hifi
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//
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// Added by Brad Hefta-Gaub on 06/11/13.
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//
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#include "VoxelProjectedShadow.h"
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#include "GeometryUtil.h"
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void VoxelProjectedShadow::setVertex(int vertex, const glm::vec2& point) {
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_vertices[vertex] = point;
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// keep track of our bounding box
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if (point.x > _maxX) {
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_maxX = point.x;
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}
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if (point.y > _maxY) {
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_maxY = point.y;
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}
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if (point.x < _minX) {
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_minX = point.x;
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}
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if (point.y < _minY) {
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_minY = point.y;
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}
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};
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bool VoxelProjectedShadow::occludes(const VoxelProjectedShadow& occludee) const {
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// first check the bounding boxes, the occludee mush be fully within the boounding box of this shadow
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if ((occludee.getMaxX() > getMaxX()) ||
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(occludee.getMaxY() > getMaxY()) ||
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(occludee.getMinX() < getMinX()) ||
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(occludee.getMinY() < getMinY())) {
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return false;
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}
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// if we got this far, then check each vertex of the occludee, if all those points
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// are inside our polygon, then the tested occludee is fully occluded
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for(int i = 0; i < occludee.getVertexCount(); i++) {
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if (!pointInside(occludee.getVertex(i))) {
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return false;
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}
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}
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// if we got this far, then indeed the occludee is fully occluded by us
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return true;
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}
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bool VoxelProjectedShadow::pointInside(const glm::vec2& point) const {
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bool pointInside = false; // assume the worst
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// first check the bounding boxes, the point mush be fully within the boounding box of this shadow
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if ((point.x > getMaxX()) ||
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(point.y > getMaxY()) ||
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(point.x < getMinX()) ||
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(point.y < getMinY())) {
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return false;
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}
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float e = (getMaxX() - getMinX()) / 100.0f; // some epsilon
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// We need to have one ray that goes from a known outside position to the point in question. We'll pick a
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// start point just outside of our min X
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glm::vec2 r1p1(getMinX() - e, point.y);
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glm::vec2 r1p2(point);
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glm::vec2 r2p1(getVertex(getVertexCount()-1)); // start with last vertex to first vertex
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glm::vec2 r2p2;
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// Test the ray against all sides
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int intersections = 0;
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for (int i = 0; i < getVertexCount(); i++) {
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r2p2 = getVertex(i);
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if (doLineSegmentsIntersect(r1p1, r1p2, r2p1, r2p2)) {
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intersections++;
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}
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r2p1 = r2p2; // set up for next side
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}
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// If odd number of intersections, we're inside
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return ((intersections & 1) == 1);
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}
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//
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// VoxelProjectedShadow.cpp - The projected shadow (on the 2D view plane) for a voxel
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// hifi
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//
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// Added by Brad Hefta-Gaub on 06/11/13.
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//
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#include "VoxelProjectedShadow.h"
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#include "GeometryUtil.h"
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bool BoundingBox::contains(const BoundingBox& box) const {
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return (
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(box.corner.x >= corner.x) &&
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(box.corner.y >= corner.y) &&
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(box.corner.x + box.size.x <= corner.x + size.x) &&
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(box.corner.y + box.size.y <= corner.y + size.y)
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);
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};
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void VoxelProjectedShadow::setVertex(int vertex, const glm::vec2& point) {
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_vertices[vertex] = point;
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// keep track of our bounding box
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if (point.x > _maxX) {
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_maxX = point.x;
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}
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if (point.y > _maxY) {
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_maxY = point.y;
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}
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if (point.x < _minX) {
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_minX = point.x;
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}
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if (point.y < _minY) {
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_minY = point.y;
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}
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};
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bool VoxelProjectedShadow::occludes(const VoxelProjectedShadow& occludee) const {
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// first check the bounding boxes, the occludee mush be fully within the boounding box of this shadow
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if ((occludee.getMaxX() > getMaxX()) ||
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(occludee.getMaxY() > getMaxY()) ||
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(occludee.getMinX() < getMinX()) ||
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(occludee.getMinY() < getMinY())) {
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return false;
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}
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// if we got this far, then check each vertex of the occludee, if all those points
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// are inside our polygon, then the tested occludee is fully occluded
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for(int i = 0; i < occludee.getVertexCount(); i++) {
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if (!pointInside(occludee.getVertex(i))) {
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return false;
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}
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}
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// if we got this far, then indeed the occludee is fully occluded by us
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return true;
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}
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bool VoxelProjectedShadow::pointInside(const glm::vec2& point) const {
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// first check the bounding boxes, the point mush be fully within the boounding box of this shadow
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if ((point.x > getMaxX()) ||
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(point.y > getMaxY()) ||
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(point.x < getMinX()) ||
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(point.y < getMinY())) {
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return false;
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}
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float e = (getMaxX() - getMinX()) / 100.0f; // some epsilon
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// We need to have one ray that goes from a known outside position to the point in question. We'll pick a
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// start point just outside of our min X
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glm::vec2 r1p1(getMinX() - e, point.y);
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glm::vec2 r1p2(point);
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glm::vec2 r2p1(getVertex(getVertexCount()-1)); // start with last vertex to first vertex
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glm::vec2 r2p2;
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// Test the ray against all sides
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int intersections = 0;
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for (int i = 0; i < getVertexCount(); i++) {
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r2p2 = getVertex(i);
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if (doLineSegmentsIntersect(r1p1, r1p2, r2p1, r2p2)) {
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intersections++;
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}
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r2p1 = r2p2; // set up for next side
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}
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// If odd number of intersections, we're inside
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return ((intersections & 1) == 1);
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}
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@ -1,51 +1,62 @@
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//
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// VoxelProjectedShadow.h - The projected shadow (on the 2D view plane) for a voxel
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// hifi
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//
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// Added by Brad Hefta-Gaub on 06/11/13.
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//
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#ifndef _VOXEL_PROJECTED_SHADOW_
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#define _VOXEL_PROJECTED_SHADOW_
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#include <glm/glm.hpp>
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const int MAX_SHADOW_VERTEX_COUNT = 6;
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typedef glm::vec2 ShadowVertices[MAX_SHADOW_VERTEX_COUNT];
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class VoxelProjectedShadow
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{
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public:
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VoxelProjectedShadow() : _vertexCount(0), _maxX(0.0f), _maxY(0.0f), _minX(FLT_MAX), _minY(FLT_MAX) { };
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VoxelProjectedShadow(int vertexCount) : _vertexCount(vertexCount), _maxX(0.0f), _maxY(0.0f), _minX(FLT_MAX), _minY(FLT_MAX)
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{ };
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~VoxelProjectedShadow() { };
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const ShadowVertices& getVerices() const { return _vertices; };
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const glm::vec2& getVertex(int i) const { return _vertices[i]; };
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void setVertex(int vertex, const glm::vec2& point);
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int getVertexCount() const { return _vertexCount; };
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void setVertexCount(int vertexCount) { _vertexCount = vertexCount; };
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bool occludes(const VoxelProjectedShadow& occludee) const;
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bool pointInside(const glm::vec2& point) const;
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float getMaxX() const { return _maxX; }
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float getMaxY() const { return _maxY; }
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float getMinX() const { return _minX; }
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float getMinY() const { return _minY; }
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private:
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int _vertexCount;
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ShadowVertices _vertices;
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float _maxX;
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float _maxY;
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float _minX;
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float _minY;
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};
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#endif // _VOXEL_PROJECTED_SHADOW_
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//
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// VoxelProjectedShadow.h - The projected shadow (on the 2D view plane) for a voxel
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// hifi
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//
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// Added by Brad Hefta-Gaub on 06/11/13.
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//
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#ifndef _VOXEL_PROJECTED_SHADOW_
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#define _VOXEL_PROJECTED_SHADOW_
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#include <glm/glm.hpp>
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const int MAX_SHADOW_VERTEX_COUNT = 6;
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typedef glm::vec2 ShadowVertices[MAX_SHADOW_VERTEX_COUNT];
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class BoundingBox {
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public:
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BoundingBox(glm::vec2 corner, glm::vec2 size) : corner(corner), size(size) {};
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glm::vec2 corner;
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glm::vec2 size;
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bool contains(const BoundingBox& box) const;
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};
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class VoxelProjectedShadow {
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public:
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VoxelProjectedShadow(int vertexCount = 0) :
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_vertexCount(vertexCount), _maxX(-FLT_MAX), _maxY(-FLT_MAX), _minX(FLT_MAX), _minY(FLT_MAX)
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{ };
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~VoxelProjectedShadow() { };
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const ShadowVertices& getVerices() const { return _vertices; };
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const glm::vec2& getVertex(int i) const { return _vertices[i]; };
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void setVertex(int vertex, const glm::vec2& point);
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int getVertexCount() const { return _vertexCount; };
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void setVertexCount(int vertexCount) { _vertexCount = vertexCount; };
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bool occludes(const VoxelProjectedShadow& occludee) const;
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bool pointInside(const glm::vec2& point) const;
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float getMaxX() const { return _maxX; }
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float getMaxY() const { return _maxY; }
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float getMinX() const { return _minX; }
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float getMinY() const { return _minY; }
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BoundingBox getBoundingBox() const {
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return BoundingBox(glm::vec2(_minX,_minY), glm::vec2(_maxX - _minX, _maxY - _minY));
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};
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private:
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int _vertexCount;
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ShadowVertices _vertices;
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float _maxX;
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float _maxY;
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float _minX;
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float _minY;
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};
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#endif // _VOXEL_PROJECTED_SHADOW_
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