How to Get Started with OptiX 7

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Originally published at: https://developer.nvidia.com/blog/how-to-get-started-with-optix-7/

The evolution of a production-tested high performance ray tracing API Image courtesy of © Dabarti Studio, rendered with V-Ray Next GPU There has been a recent shift in high-performance API design towards providing lower-level control of resource management and execution scheduling. This design evolution allows experienced developers to be in full control of their application…

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Looks like the template parameters (<t> etc.) are missing in the "Shader Binding Table" code snippet above, probably mangled by your CMS and interpreted as HTML tags.

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Can the curve primitives be utilized to create closed shapes? For instance, using a series of linear segments to define a hexagon-type curve shape?

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I want to test your denoiser in NVIDIA-OptiX-SDK-7.3.0-linux64-x86_64/SDK/optixDenoiser. However, I don’t know how to generate some basic inputs like soane-BSDF, soane-Normal and soane-Flow. I have tried to produce them in NVIDIA-OptiX-SDK-7.3.0-linux64-x86_64/SDK/optixSphere, but I don’t even know how to draw one more ball.

I modified few lines in optixSphere.cpp as below, but I still can’t see another sphere I add.

CUdeviceptr hitgroup_record;
            size_t      hitgroup_record_size = sizeof( HitGroupSbtRecord );
            CUDA_CHECK( cudaMalloc(
                    reinterpret_cast<void**>( &hitgroup_record ),
                    hitgroup_record_size * 2
                    ) );
            HitGroupSbtRecord hg_sbt[2];
            hg_sbt[0].data.sphere.center = { 0.8f, 0.0f, 0.0f };
            hg_sbt[0].data.sphere.radius = 0.5f;
            hg_sbt[1].data.sphere.center = { -0.8f, 0.0f, 0.0f };
            hg_sbt[1].data.sphere.radius = 0.5f;
            OPTIX_CHECK( optixSbtRecordPackHeader( hitgroup_prog_group, &hg_sbt[0] ) );
            OPTIX_CHECK( optixSbtRecordPackHeader( hitgroup_prog_group, &hg_sbt[1] ) );
            CUDA_CHECK( cudaMemcpy(
                        reinterpret_cast<void*>( hitgroup_record ),
                        hg_sbt,
                        hitgroup_record_size*2,
                        cudaMemcpyHostToDevice
                        ) );

            sbt.raygenRecord                = raygen_record;
            sbt.missRecordBase              = miss_record;
            sbt.missRecordStrideInBytes     = sizeof( MissSbtRecord );
            sbt.missRecordCount             = 1;
            sbt.hitgroupRecordBase          = hitgroup_record;
            sbt.hitgroupRecordStrideInBytes = sizeof( HitGroupSbtRecord );
            sbt.hitgroupRecordCount         = 2;
        }

To sum up, I have two questions. First, how to draw multiple objects (including spheres and triangles) in one scene. Second, how to use optix7 to generate soane-BSDF, soane-Normal and soane-Flow in exr format.

My account is fangtiancheng@sjtu.edu.cn or 1773701277@qq.com. I would be appreciated if you could answer my question.

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Would you please write to more beginner centric technical staff on OptiX? There are few on NVIDIA ON DEMAND, but those are of high level. Also, I think a few video tutorials are really missing in OptiX. After SIGGRAPH 2019 Ingo Wald’s talk, nobody actually made any other video tutorial series.