Change floor parameters for Vehicle shaders in asset editor.

Vehicle_FloorParams.cs

var asset = ToolsModifierControl.toolController.m_editPrefabInfo as VehicleInfo;
var vec = new Vector4(0.0f, 5.0f, 0.0f, 0.0f); // (foundation, floor height, width, length)
asset.m_material.SetVector("_FloorParams", vec);