opensim-development – Rev 1
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using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using Nini.Config;
namespace OpenSim.Region.Physics.BulletSPlugin
{
public struct MaterialAttributes
{
// Material type values that correspond with definitions for LSL
public enum Material : int
{
Stone = 0,
Metal,
Glass,
Wood,
Flesh,
Plastic,
Rubber,
Light,
// Hereafter are BulletSim additions
Avatar,
NumberOfTypes // the count of types in the enum.
}
// Names must be in the order of the above enum.
// These names must coorespond to the lower case field names in the MaterialAttributes
// structure as reflection is used to select the field to put the value in.
public static readonly string[] MaterialAttribs = { "Density", "Friction", "Restitution"};
public MaterialAttributes(string t, float d, float f, float r)
{
type = t;
density = d;
friction = f;
restitution = r;
}
public string type;
public float density;
public float friction;
public float restitution;
}
public static class BSMaterials
{
// Attributes for each material type
private static readonly MaterialAttributes[] Attributes;
// Map of material name to material type code
public static readonly Dictionary<string, MaterialAttributes.Material> MaterialMap;
static BSMaterials()
{
// Attribute sets for both the non-physical and physical instances of materials.
Attributes = new MaterialAttributes[(int)MaterialAttributes.Material.NumberOfTypes * 2];
// Map of name to type code.
MaterialMap = new Dictionary<string, MaterialAttributes.Material>();
MaterialMap.Add("Stone", MaterialAttributes.Material.Stone);
MaterialMap.Add("Metal", MaterialAttributes.Material.Metal);
MaterialMap.Add("Glass", MaterialAttributes.Material.Glass);
MaterialMap.Add("Wood", MaterialAttributes.Material.Wood);
MaterialMap.Add("Flesh", MaterialAttributes.Material.Flesh);
MaterialMap.Add("Plastic", MaterialAttributes.Material.Plastic);
MaterialMap.Add("Rubber", MaterialAttributes.Material.Rubber);
MaterialMap.Add("Light", MaterialAttributes.Material.Light);
MaterialMap.Add("Avatar", MaterialAttributes.Material.Avatar);
}
// This is where all the default material attributes are defined.
public static void InitializeFromDefaults(ConfigurationParameters parms)
{
// Values from http://wiki.secondlife.com/wiki/PRIM_MATERIAL
float dDensity = parms.defaultDensity;
float dFriction = parms.defaultFriction;
float dRestitution = parms.defaultRestitution;
Attributes[(int)MaterialAttributes.Material.Stone] =
new MaterialAttributes("stone",dDensity, 0.8f, 0.4f);
Attributes[(int)MaterialAttributes.Material.Metal] =
new MaterialAttributes("metal",dDensity, 0.3f, 0.4f);
Attributes[(int)MaterialAttributes.Material.Glass] =
new MaterialAttributes("glass",dDensity, 0.2f, 0.7f);
Attributes[(int)MaterialAttributes.Material.Wood] =
new MaterialAttributes("wood",dDensity, 0.6f, 0.5f);
Attributes[(int)MaterialAttributes.Material.Flesh] =
new MaterialAttributes("flesh",dDensity, 0.9f, 0.3f);
Attributes[(int)MaterialAttributes.Material.Plastic] =
new MaterialAttributes("plastic",dDensity, 0.4f, 0.7f);
Attributes[(int)MaterialAttributes.Material.Rubber] =
new MaterialAttributes("rubber",dDensity, 0.9f, 0.9f);
Attributes[(int)MaterialAttributes.Material.Light] =
new MaterialAttributes("light",dDensity, dFriction, dRestitution);
Attributes[(int)MaterialAttributes.Material.Avatar] =
new MaterialAttributes("avatar",3.5f, 0.2f, 0f);
Attributes[(int)MaterialAttributes.Material.Stone + (int)MaterialAttributes.Material.NumberOfTypes] =
new MaterialAttributes("stonePhysical",dDensity, 0.8f, 0.4f);
Attributes[(int)MaterialAttributes.Material.Metal + (int)MaterialAttributes.Material.NumberOfTypes] =
new MaterialAttributes("metalPhysical",dDensity, 0.3f, 0.4f);
Attributes[(int)MaterialAttributes.Material.Glass + (int)MaterialAttributes.Material.NumberOfTypes] =
new MaterialAttributes("glassPhysical",dDensity, 0.2f, 0.7f);
Attributes[(int)MaterialAttributes.Material.Wood + (int)MaterialAttributes.Material.NumberOfTypes] =
new MaterialAttributes("woodPhysical",dDensity, 0.6f, 0.5f);
Attributes[(int)MaterialAttributes.Material.Flesh + (int)MaterialAttributes.Material.NumberOfTypes] =
new MaterialAttributes("fleshPhysical",dDensity, 0.9f, 0.3f);
Attributes[(int)MaterialAttributes.Material.Plastic + (int)MaterialAttributes.Material.NumberOfTypes] =
new MaterialAttributes("plasticPhysical",dDensity, 0.4f, 0.7f);
Attributes[(int)MaterialAttributes.Material.Rubber + (int)MaterialAttributes.Material.NumberOfTypes] =
new MaterialAttributes("rubberPhysical",dDensity, 0.9f, 0.9f);
Attributes[(int)MaterialAttributes.Material.Light + (int)MaterialAttributes.Material.NumberOfTypes] =
new MaterialAttributes("lightPhysical",dDensity, dFriction, dRestitution);
Attributes[(int)MaterialAttributes.Material.Avatar + (int)MaterialAttributes.Material.NumberOfTypes] =
new MaterialAttributes("avatarPhysical",3.5f, 0.2f, 0f);
}
// Under the [BulletSim] section, one can change the individual material
// attribute values. The format of the configuration parameter is:
// <materialName><Attribute>["Physical"] = floatValue
// For instance:
// [BulletSim]
// StoneFriction = 0.2
// FleshRestitutionPhysical = 0.8
// Materials can have different parameters for their static and
// physical instantiations. When setting the non-physical value,
// both values are changed. Setting the physical value only changes
// the physical value.
public static void InitializefromParameters(IConfig pConfig)
{
foreach (KeyValuePair<string, MaterialAttributes.Material> kvp in MaterialMap)
{
string matName = kvp.Key;
foreach (string attribName in MaterialAttributes.MaterialAttribs)
{
string paramName = matName + attribName;
if (pConfig.Contains(paramName))
{
float paramValue = pConfig.GetFloat(paramName);
SetAttributeValue((int)kvp.Value, attribName, paramValue);
// set the physical value also
SetAttributeValue((int)kvp.Value + (int)MaterialAttributes.Material.NumberOfTypes, attribName, paramValue);
}
paramName += "Physical";
if (pConfig.Contains(paramName))
{
float paramValue = pConfig.GetFloat(paramName);
SetAttributeValue((int)kvp.Value + (int)MaterialAttributes.Material.NumberOfTypes, attribName, paramValue);
}
}
}
}
// Use reflection to set the value in the attribute structure.
private static void SetAttributeValue(int matType, string attribName, float val)
{
// Get the current attribute values for this material
MaterialAttributes thisAttrib = Attributes[matType];
// Find the field for the passed attribute name (eg, find field named 'friction')
FieldInfo fieldInfo = thisAttrib.GetType().GetField(attribName.ToLower());
if (fieldInfo != null)
{
fieldInfo.SetValue(thisAttrib, val);
// Copy new attributes back to array -- since MaterialAttributes is 'struct', passed by value, not reference.
Attributes[matType] = thisAttrib;
}
}
// Given a material type, return a structure of attributes.
public static MaterialAttributes GetAttributes(MaterialAttributes.Material type, bool isPhysical)
{
int ind = (int)type;
if (isPhysical) ind += (int)MaterialAttributes.Material.NumberOfTypes;
return Attributes[ind];
}
}
}