The Cura 4.9 release will have expanded functionality. If you have a plug-in that uses this functionality, marking it as using SDK 7.5.0 will notify older Cura releases that they can't use that plug-in.
All of our current layer view colour schemes are properties of a line, not of a vertex. The line has a single feedrate, a single line type, a single layer thickness, a single material colour and a single width. This is even limited by the g-code specification itself, which is unable to represent lines with varying line width. However, we store this information in the vertices, the vertex data being the only data sent to layer view since layer view is sent as polylines to the shader.
This change makes the entire line take on the colour scheme of the vertex where its representative data is stored. This data is intended for the line, not just for that vertex, so it makes sense that the entire line listens to the data of the correct vertex, not just the nearest vertex of the line's endpoint.
Encountered as I made a failed attempt at solving the issue with rendering transparent support. I tried to order vertices appropriately but failed miserably.
This fixes a very old bug in Cura where sometimes after re-slicing it would display the layer as if you've been going horizontal through the path slider, even if you never touched the horizontal path slider.
This was caused by a tracking flag in the SimulationPass, _switching_layers. This bit of state in the SimulationPass was tracking whether the user is going through the vertical layer slider (True) or the horizontal path slider (False). If False, the nozzle mesh is drawn and lower layers get drawn in a shadowy shader. The state of this flag was being updated on every render by looking at whether the previous render has the same current layer number but a different path index. If so, it changed to False, meaning that it assumes you're going through the paths on a layer and things get shadowy.
However if you slice a different object such that the number of layers stay the same (or at least the current layer) but the number of paths on a layer change (e.g. by reducing Maximum Resolution, or by loading a different model that happens to be equally tall) then it would falsely think you were going through the horizontal path slider.
This change effectively resets this state flag when any layer data is changed in the scene. So if you re-slice, it always goes back to _switching_layers = True.
The side effect is that if you were going through the paths of a layer and you re-slice, you won't end up on the same path even if the number of paths on your current layer didn't change due to the reslice. But I think that is more towards what the user would accept a re-slice to do anyway.
I decided to take a look into this bug because I'm making a script to automatically refresh the screenshots of the Settings Guide plug-in. This script frequently hits cases like this, and it's easier to fix this bug than to work around it in my script.
Also adds a "show starts" option to the SimulationViewMenuComponent and corresponding logic
SimulationPass.py adds a prev_line_types attribute to the shader, which the shader uses to compare with its line_type to detect starts.
This reverts commit 28f4d8513db7efce17bfd8b80fa7c8b237fd1c18.
The original revert was to revert an accidental merge from master to 4.7. This now reverts the revert on Master, so that we still have those changes on Master.
