Create PickItemsJob than can be used to select a render item in front of the camera

libraries/render-utils/src/PickItemsJob.cpp

@@ -0,0 +1,51 @@
+//
+//  PickItemsJob.cpp
+//  render-utils/src/
+//
+//  Created by Olivier Prat on 08/08/17.
+//  Copyright 2017 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+#include "PickItemsJob.h"
+
+void PickItemsJob::configure(const Config& config) {
+	_isEnabled = config.isEnabled;
+}
+
+void PickItemsJob::run(const render::RenderContextPointer& renderContext, const PickItemsJob::Input& input, PickItemsJob::Output& output) {
+    output.clear();
+
+	if (_isEnabled) {
+		float minIsectDistance = std::numeric_limits<float>::max();
+		auto& itemBounds = input;
+		auto itemID = findNearestItem(renderContext, itemBounds, minIsectDistance);
+
+        if (render::Item::isValidID(itemID)) {
+            output.emplace_back(itemID);
+        }
+	}
+}
+
+render::ItemID PickItemsJob::findNearestItem(const render::RenderContextPointer& renderContext, const render::ItemBounds& inputs, float& minIsectDistance) const {
+	const glm::vec3 rayOrigin = renderContext->args->getViewFrustum().getPosition();
+	const glm::vec3 rayDirection = renderContext->args->getViewFrustum().getDirection();
+	BoxFace face;
+	glm::vec3 normal;
+	float isectDistance;
+	render::ItemID nearestItem = render::Item::INVALID_ITEM_ID;
+	const float minDistance = 1.f;
+	const float maxDistance = 50.f;
+
+	for (const auto& itemBound : inputs) {
+		if (!itemBound.bound.contains(rayOrigin) && itemBound.bound.findRayIntersection(rayOrigin, rayDirection, isectDistance, face, normal)) {
+			auto& item = renderContext->_scene->getItem(itemBound.id);
+			if (item.getKey().isWorldSpace() && isectDistance>minDistance && isectDistance < minIsectDistance && isectDistance<maxDistance) {
+				nearestItem = itemBound.id;
+				minIsectDistance = isectDistance;
+			}
+		}
+	}
+	return nearestItem;
+}

libraries/render-utils/src/PickItemsJob.h

@@ -0,0 +1,53 @@
+//
+//  PickItemsJob.h
+//  render-utils/src/
+//
+//  Created by Olivier Prat on 08/08/17.
+//  Copyright 2017 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#ifndef hifi_render_utils_PickItemsJob_h
+#define hifi_render_utils_PickItemsJob_h
+
+#include <render/Engine.h>
+
+class PickItemsConfig : public render::Job::Config {
+	Q_OBJECT
+		Q_PROPERTY(bool isEnabled MEMBER isEnabled NOTIFY dirty)
+
+public:
+
+	bool isEnabled{ false };
+
+signals:
+
+	void dirty();
+};
+
+class PickItemsJob {
+
+public:
+
+	using Config = PickItemsConfig;
+	using Input = render::ItemBounds;
+	using Output = render::ItemBounds;
+	using JobModel = render::Job::ModelIO<PickItemsJob, Input, Output, Config>;
+
+	PickItemsJob() {}
+
+	void configure(const Config& config);
+	void run(const render::RenderContextPointer& renderContext, const PickItemsJob::Input& input, PickItemsJob::Output& output);
+
+private:
+
+	bool _isEnabled{ false };
+
+	render::ItemID findNearestItem(const render::RenderContextPointer& renderContext, const render::ItemBounds& inputs, float& minIsectDistance) const;
+};
+
+#endif // hifi_render_utils_PickItemsJob_h
+
+