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Can I use float3 array for shader constants?

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Hello, I know that shader constants must be 4 floats each when passing them to the device in DirectX using SetVertexShaderConstantF(), but when I read them in the vertex shader, can I use float3 to make an array out of them? Like this: float3 PosLow[216] : register(c17); The reason is, if I use float4 then one float in each index is unused, and then I'm not having enough space for all my contants. But will this work? Peter

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