1 files changed, 56 insertions, 0 deletions
diff --git a/APEX_1.4/module/emitter/src/EmitterGeomBase.cpp b/APEX_1.4/module/emitter/src/EmitterGeomBase.cpp
new file mode 100644
index 00000000..5ae761cb
--- /dev/null
+++ b/APEX_1.4/module/emitter/src/EmitterGeomBase.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2008-2015, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * NVIDIA CORPORATION and its licensors retain all intellectual property
+ * and proprietary rights in and to this software, related documentation
+ * and any modifications thereto.  Any use, reproduction, disclosure or
+ * distribution of this software and related documentation without an express
+ * license agreement from NVIDIA CORPORATION is strictly prohibited.
+ */
+
+
+#include "Apex.h"
+#include "EmitterGeomBase.h"
+
+namespace nvidia
+{
+namespace emitter
+{
+
+/* Return percentage of new volume not covered by old volume */
+float EmitterGeomBase::computeNewlyCoveredVolume(
+    const PxMat44& oldPose,
+    const PxMat44& newPose,
+	float scale,
+    QDSRand& rand) const
+{
+	// estimate by sampling
+	const uint32_t numSamples = 100;
+	uint32_t numOutsideOldVolume = 0;
+	for (uint32_t i = 0; i < numSamples; i++)
+	{
+		if (!isInEmitter(randomPosInFullVolume(PxMat44(newPose) * scale, rand), PxMat44(oldPose) * scale))
+		{
+			numOutsideOldVolume++;
+		}
+	}
+
+	return (float) numOutsideOldVolume / numSamples;
+}
+
+
+// TODO make better, this is very slow when emitter moves slowly
+// SJB: I'd go one further, this seems mildly retarted
+PxVec3 EmitterGeomBase::randomPosInNewlyCoveredVolume(const PxMat44& pose, const PxMat44& oldPose, QDSRand& rand) const
+{
+	PxVec3 pos;
+	do
+	{
+		pos = randomPosInFullVolume(pose, rand);
+	}
+	while (isInEmitter(pos, oldPose));
+	return pos;
+}
+
+}
+} // namespace nvidia::apex