3 cbuffer UpdateVelocitiesFromPositionsWithoutVelocitiesCB : register( b0 )
12 StructuredBuffer<float4> g_vertexPositions : register( t0 );
13 StructuredBuffer<float4> g_vertexPreviousPositions : register( t1 );
14 StructuredBuffer<int> g_vertexClothIndices : register( t2 );
15 StructuredBuffer<float> g_clothDampingFactor : register( t3 );
17 RWStructuredBuffer<float4> g_vertexVelocities : register( u0 );
18 RWStructuredBuffer<float4> g_vertexForces : register( u1 );
21 [numthreads(128, 1, 1)]
23 updateVelocitiesFromPositionsWithoutVelocitiesKernel( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
26 if( nodeID < numNodes )
28 float3 position = g_vertexPositions[nodeID].xyz;
29 float3 previousPosition = g_vertexPreviousPositions[nodeID].xyz;
30 float3 velocity = g_vertexVelocities[nodeID].xyz;
31 int clothIndex = g_vertexClothIndices[nodeID];
32 float dampingFactor = g_clothDampingFactor[clothIndex];
33 float velocityCoefficient = (1.f - dampingFactor);
35 float3 difference = position - previousPosition;
37 velocity = difference*velocityCoefficient*isolverdt;
39 g_vertexVelocities[nodeID] = float4(velocity, 0.f);
40 g_vertexForces[nodeID] = float4(0.f, 0.f, 0.f, 0.f);