fade polylines (needs testing)

libraries/entities-renderer/src/RenderablePolyLineEntityItem.cpp

@@ -204,5 +204,7 @@ void RenderablePolyLineEntityItem::render(RenderArgs* args) {
     batch.setInputFormat(_format);
     batch.setInputBuffer(0, _verticesBuffer, 0, _format->getChannels().at(0)._stride);
 
+    batch._glColor4f(1.0f, 1.0f, 1.0f, Interpolate::calculateFadeRatio(_fadeStartTime));
+
     batch.draw(gpu::TRIANGLE_STRIP, _numVertices, 0);
 };

libraries/entities-renderer/src/RenderablePolyLineEntityItem.h

@@ -18,6 +18,7 @@
 #include <PolyLineEntityItem.h>
 #include "RenderableEntityItem.h"
 #include <TextureCache.h>
+#include <Interpolate.h>
 
 #include <QReadWriteLock>
 
@@ -30,9 +31,9 @@ public:
 
     virtual void render(RenderArgs* args) override;
     virtual void update(const quint64& now) override;
-    virtual bool needsToCallUpdate() const override { return true; };
+    virtual bool needsToCallUpdate() const override { return true; }
 
-    bool isTransparent() override { return true; }
+    bool isTransparent() override { return Interpolate::calculateFadeRatio(_fadeStartTime) < 1.0f; }
 
     SIMPLE_RENDERABLE();
 
@@ -49,7 +50,7 @@ protected:
     gpu::BufferView _uniformBuffer;
     unsigned int _numVertices;
     QVector<glm::vec3> _vertices;
-
+    quint64 _fadeStartTime { usecTimestampNow() };
 };
 
 

libraries/entities-renderer/src/paintStroke.slf

@@ -39,7 +39,7 @@ void main(void) {
     vec3 color = varColor.rgb;
     packDeferredFragmentTranslucent(
         interpolatedNormal * frontCondition,
-        texel.a,
+        texel.a * varColor.a,
         polyline.color * texel.rgb,
         vec3(0.01, 0.01, 0.01),
         10.0);