From a2c7b3bcc9ff863ad8f361c6cdeb537cbd13dec0 Mon Sep 17 00:00:00 2001
From: David Rowe <david@ctrlaltstudio.com>
Date: Wed, 23 Sep 2015 17:00:07 -0700
Subject: [PATCH] Orient particles to face camera but not roll with it

---
 .../src/RenderableParticleEffectEntityItem.cpp             | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libraries/entities-renderer/src/RenderableParticleEffectEntityItem.cpp b/libraries/entities-renderer/src/RenderableParticleEffectEntityItem.cpp
index 68567372e2..005252672d 100644
--- a/libraries/entities-renderer/src/RenderableParticleEffectEntityItem.cpp
+++ b/libraries/entities-renderer/src/RenderableParticleEffectEntityItem.cpp
@@ -211,9 +211,12 @@ void RenderableParticleEffectEntityItem::updateRenderItem() {
     _vertices.clear();
 
     // build vertices from particle positions and radiuses
-    const glm::vec3 up = frustum->getUp();
-    const glm::vec3 right = frustum->getRight();
+    glm::vec3 frustumPosition = frustum->getPosition();
     for (auto&& particle : particleDetails) {
+        glm::vec3 particleDirection = particle.position - frustumPosition;
+        glm::vec3 right = glm::normalize(glm::cross(glm::vec3(0.0f, 1.0f, 0.0f), particleDirection));
+        glm::vec3 up = glm::normalize(glm::cross(right, particleDirection));
+
         glm::vec3 upOffset = up * particle.radius;
         glm::vec3 rightOffset = right * particle.radius;
         // generate corners of quad aligned to face the camera.