layout(push_constant) uniform Instance {
    mat4 VP;
    vec3 posCam;
    float radius;
    float curvature;
} u_instance;

uint32_t offset = 0;
uint32_t size = 21 *sizeof(float);
vk::PushConstantRange range {vk::ShaderStageFlagBits::eGeometry,offset,size};

Push constant range covering variable starting at offset 0 not accessible from stage VK_SHADER_STAGE_GEOMETRY_BIT