S4379-opengl-44-scene-rendering-techniques.pdf

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OpenGL 4.4

Scene Rendering Techniques

Christoph Kubisch

Markus Tavenrath

- ckubisch@nvidia.com

- matavenrath@nvidia.com

Scene Rendering



Scene complexity increases

–

Deep hierarchies, traversal expensive

–

Large objects split up into a lot of little

pieces, increased draw call count

–

Unsorted rendering, lot of state changes



CPU becomes bottleneck when

rendering those scenes



Removing SceneGraph traversal:

–

http://on-demand.gputechconf.com/gtc/2013/presentations/S3032-Advanced-

Scenegraph-Rendering-Pipeline.pdf

models courtesy of PTC

Challenge not necessarily obvious



Harder to render „Graphicscard“ efficiently than „Racecar“

CPU

GPU

App/GL

GPU

idle



650 000 Triangles



68 000 Parts



~ 10 Triangles per part



3 700 000 Triangles



98 000 Parts



~ 37 Triangles per part

Enabling GPU Scalability



Avoid data redundancy

–

Data stored once, referenced multiple times

–

Update only once (less host to gpu transfers)



Increase GPU workload per job (batching)

–

Further cuts API calls

–

Less driver CPU work



Minimize CPU/GPU interaction

–

Allow GPU to update its own data

–

Low API usage when scene is changed little

–

E.g. GPU-based culling

Rendering Research Framework



Avoids classic

SceneGraph design



Geometry

–

Vertex & Index-Buffer (VBO & IBO)

–

Parts (CAD features)

Same geometry

multiple objects



Material



Matrix Hierarchy



Object

References Geometry,

Matrix, Materials

Same geometry

(fan) multiple parts

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