104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
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#include "TerrainRayWalker.h"
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#include "SoftwareRenderer.h"
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#include "Scenery.h"
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#include "TerrainDefinition.h"
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#include "TexturesDefinition.h"
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#include "TerrainRenderer.h"
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#include "TexturesRenderer.h"
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TerrainRayWalker::TerrainRayWalker(SoftwareRenderer* renderer):
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renderer(renderer)
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{
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}
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void TerrainRayWalker::update()
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{
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TerrainDefinition* terrain = renderer->getScenery()->getTerrain();
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HeightInfo info = terrain->getHeightInfo();
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TexturesDefinition* textures = renderer->getScenery()->getTextures();
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double disp = textures->getMaximalDisplacement();
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ymin = info.min_height - disp;
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ymax = info.max_height + disp;
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ydispmin = -disp;
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ydispmax = disp;
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minstep = 0.01 * terrain->scaling / (double)renderer->render_quality;
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maxstep = 1.0 * terrain->scaling;
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}
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bool TerrainRayWalker::startWalking(Vector3 start, const Vector3 &direction, double escaping_factor, double max_length, TerrainHitResult &result)
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{
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TerrainRenderer* terrain_renderer = renderer->getTerrainRenderer();
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TexturesRenderer* textures_renderer = renderer->getTexturesRenderer();
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TerrainRenderer::TerrainResult terrain_result;
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Vector3 end, displaced;
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bool hit;
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double diff;
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double step_length = minstep;
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double walked_length = 0.0;
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do
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{
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// Perform a step
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end = start.add(direction.scale(step_length));
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// Get the terrain info at end (without textures displacement)
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terrain_result = terrain_renderer->getResult(end.x, end.z, true, false);
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diff = end.y - terrain_result.location.y;
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// If we are very under the terrain, consider a hit
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if (diff < ydispmin)
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{
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hit = true;
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}
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// If we are close enough to the terrain, apply displacement
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else if (diff < ydispmax)
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{
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displaced = textures_renderer->displaceTerrain(terrain_result);
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diff = end.y - displaced.y;
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hit = (diff < 0.0);
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}
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if (hit)
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{
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// Refine the hit with dichotomy at high quality
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/*if (renderer->render_quality > 7)
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{
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end = refineHit(start, end, step_length);
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}*/
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// Find an escape
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/*if (escaping_factor != 0.0)
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{
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result.escape_length = findEscape(end, walked_length, escaping_factor, max_length);
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}*/
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result.hit_location = end;
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}
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else
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{
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// Prepare next step
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start = end;
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walked_length += step_length;
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step_length = diff / (double)renderer->render_quality;
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if (step_length < minstep)
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{
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step_length = minstep;
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}
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else if (step_length > maxstep)
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{
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step_length = maxstep;
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}
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}
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} while (not hit and start.y < ymax and walked_length < max_length);
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return hit;
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}
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