Interpolators of Particle Dynamic Parameters Need "nointerpolation".

Rendering - Niagara - Aug 1, 2019

Regardless Niagara or Cascade, dynamic parameters for particles are passed to pixel shaders from vertex shaders via InterpolantsVSToPS. It can cause a precision error on some materials, for example ...

Adding Niagara system to a projectile causes a crash

Rendering - Niagara - Jul 29, 2019

Adding a Niagara system to a BP_Projectile in a C++ First Person Project  and then restarting it causes the editor to crash. Tested in 4.21.2 (CL - 4753647), 4.22.3 (CL - 7053647), 4.23 (CL - 744 ...

A Niagara system will only use one spawn rate curve when it has more than one emitter with different spawn rate curves

Rendering - Niagara - Jul 19, 2019

Systems that have more than one emitter that both have unique spawn rate curves will only used the most recently added emitter's spawn rate curve for all emitters. ...

Niagara Memory Leak in vertex buffer when increasing particle spawn rate on CPU sims

Rendering - Niagara - Jul 16, 2019

Increasing the spawn rate of a CPU particle sim will cause a memory leak in the vertex buffer.  ...

Niagara Mesh Particles do not face camera when using Camera Position facing mode

Rendering - Niagara - Jul 12, 2019

Niagara mesh particles will not face the camera when using camera position as the facing mode. The particles seem to face the direction the would if their position was at the origin. ...

Niagara Sample Static Mesh. Source Not Working

Rendering - Niagara - Jul 7, 2019

Static meshes are not rendered as particles when using the Static mesh module in Niagara and setting its source to a static mesh in the scene. Tested in 4.21.2 (CL -  4753647), 4.22 (CL - 7053647), ...

In the DragForce module drag amounts greater than one can accelerate the particle instead of slowing it down.

Rendering - Niagara - Jun 10, 2019

Drag force allows for values greater than 1, which can cause the drag force to exceed the initial velocity, which will continue to compound until a NaN is reached or the particle's lifetime is up. ...

Niagara emitters occassionally don't receive death events

Rendering - Niagara - Jun 6, 2019

The death events for Niagara emitters on a Niagara System are ignored every few loops. Tested in 4.21.2 (CL - 4753647), 4.22.2 (CL - 6547378), 4.23 (CL - 6859026) ...

Niagara Using a VAT has Intense Motion Blur

Rendering - Niagara - Jun 3, 2019

Niagara mesh particle using a VAT has Intense Motion Blur. Found in 4.22 CL# 6574378 and 4.23 CL# 6763247 Unable to test this in 4.21 and 4.20 as the project provided with assets needed was made i ...

Package build crashes when using Niagara system on a Skeletal mesh

Rendering - Niagara - May 29, 2019

Packaging a project having a skeletal mesh with a niagara system attached to it in the scene causes the build to crash when running the executable.  I have attached the log and dmp files relevant t ...