4/11/ e.solutions GmbH

Transcription

1

2 Cluster Instrument just two circles and two lines? 2

3 A graphical Cluster Instrument s Benchmark Your analogue cluster instrument Challenges: Start-Up Time Reactivity Your every day digital devices Challenges: Materials, Effects and Animations Configurability 3

4 System Overview Project start in 2011 First SOP in the Audi TT in 2014 Currently available for R8, A4/A5, Q7, Q2 and all sport, racing and hybrid variants Two general configurations available: infotainment main-unit and cluster instrument share one single display in driver-centric cars two displays with freedom to move functionality between the displays Audi TT Audi R8 Audi Q7 Audi A4 4

5 System Architecture Cluster Instrument s capturing connected to Infotainment Main-Unit s LVDS output main-unit display in Q7, A4 Cluster Rendered Content Overlay Y Overlay X FPD- Link3 to CSI-2 LVDS CAN Cluster Content Main-Unit Functionality - multimedia - navigation - telephony - connectivity - car - Cluster Instrument Cluster based on nvidia Tegra3 (dual core CPU, 8 fragment units, 4 vertex units); 12.3 display at 1440x540, 512MB DDR3, 64MB NOR, 4GB NAND) MOST Infotainment Main-Unit Infotainment main-unit (Tegra3 quad core CPU) connected to cluster instrument via LVDS line 5

6 Virtual Cockpit Start-Up 100% CPU load in stages 2 and 3 Stage 1: load minimal system in compressed form => decompress, using all cores Stage 2: start executing OS, initial set of drivers; in parallel continue loading compressed resources / decompress Stage 3: continue loading non system critical parts, using DMA, while initializing all processes Stage 4: cluster is already in full operation => load nonessential modules Virtual Cockpit Start-Up Early Mode Functions critical for driving only Full Function Mode 6

7 Virtual Cockpit Reactivity Benchmark result: fragment limitation => do only redraw those parts that have changed 7

8 Virtual Cockpit Reactivity Standard rendering approach Each frame: Update all objects in scene graph Clear back buffer Render all objects to back buffer Swap back and front buffer Render only elements that have changed basic idea: use early fragment test to prevent unnecessary executions of fragment shader i.e. use stencil test to discard fragments before fragment shader execution/blending Clear back buffer Each frame: Update all objects Render mask of objects that have changed to stencil buffer Render only fragments with active stencil Swap back and front buffer 8

9 Virtual Cockpit Reactivity: Needle Dynamics Problem statement: given a display with 60 Hz Refresh limited to every 1/60 second revmeter changes with a maximum of 7 degrees per 1/60 second Needle will jump between frames (stroboscope effect) Graphical solution: motion blur i.e. needle is distributed over area it moves between frames Textbook version: needle intensity is distributed linearly over range covered within 1/60 second effect: needle gets wide and transparent Target version: needle is drawn direction-dependent at end of range + intensity is distributed non-linearly 9

10 Virtual Cockpit Layout New challenge: dynamic element layout and positioning Tend to change late in the project requires a modeling solution: attribute constraints Classic Skin Sport Skin 10

11 Virtual Cockpit Layout: Attribute Constraints Constraints allow objects to automatically update their attributes in response to changing attributes in other objects It can be a simple dependency or a complex expression A constraint can connect any node to any other node in the scene tree NodeA.Translation.X -> NodeA.Color.R NodeA.Translation.X -> NodeB.Translation.X A constraint can handle multiple source attributes and one target attribute with one or multiple components Attributes are being referenced by path (aliases can be defined) and can be set by code or by modelling tool 11

12 Virtual Cockpit layout: Constraints-Tree 12

13 Virtual Cockpit Material Material tends to change late in the project requires a modeling solution: attribute constraints + shader programs 13

14 Virtual Cockpit View Configuration Cluster View Kleine Bühne Infotainment View Große Bühne 14

15 Virtual Cockpit Languages and Units one system North America Europe Chinese Arabic (right to left orientation) Russian 15

16 Virtual Cockpit Configurable Content 16

17 Thank you very much!