50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
#include "Contents/ModelActor.h"
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#include <bit>
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namespace {
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float Absolute(float value) {
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return std::bit_cast<float>(std::bit_cast<unsigned>(value) & 0x7FFFFFFFu);
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}
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bool Intersects(const float* ray, const OrientedBounds& bounds) {
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const float delta[3] = {bounds.center[0] - ray[0], bounds.center[1] - ray[1], bounds.center[2] - ray[2]};
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float near = -999999.0f;
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float far = 999999.0f;
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for (unsigned axis = 0; axis < 3; ++axis) {
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const float* direction = bounds.axes[axis];
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const float distance = (delta[1] * direction[1] + delta[0] * direction[0]) + delta[2] * direction[2];
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const float along = (ray[3] * direction[0] + ray[4] * direction[1]) + ray[5] * direction[2];
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const float radius = bounds.halfSize[axis];
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if (Absolute(along) <= 0.00001f) {
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if (-distance - radius > 0.0f || radius - distance < 0.0f) {
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return false;
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}
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} else {
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const float inverse = 1.0f / along;
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const float first = (radius + distance) * inverse;
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const float second = (distance - radius) * inverse;
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const float lower = first <= second ? first : second;
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const float upper = first <= second ? second : first;
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near = lower > near ? lower : near;
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far = upper < far ? upper : far;
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if (near > far || far < 0.0f) {
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return false;
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}
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}
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}
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return near <= 0.0f ? far <= ray[6] : near <= ray[6];
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}
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}
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// OFFSET: 0x00AB7810
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// FUNCTION: fn_17487
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void C3dActor::MarkOccluded(const float* ray) {
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if (this->occlusionEnabled == 1 && Intersects(ray, this->oriented)) {
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this->occluded = 1;
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}
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}
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