/// <summary>
/// Import materials step by step. Call this until it returns false.
/// </summary>
/// <param name="info">Progress information to be updated</param>
/// <returns>Return true if in progress, false otherwise.</returns>
public bool BuildMaterials(ProgressInfo info)
{
if (materialData == null)
{
Debug.LogWarning("No material library defined.");
return(false);
}
if (info.materialsLoaded >= materialData.Count)
{
return(false);
}
MaterialData matData = materialData[info.materialsLoaded];
info.materialsLoaded++;
if (currMaterials.ContainsKey(matData.materialName))
{
Debug.LogWarning("Duplicate material found: " + matData.materialName + ". Repeated occurence ignored");
}
else
{
currMaterials.Add(matData.materialName, BuildMaterial(matData));
}
return(info.materialsLoaded < materialData.Count);
}
/// <summary>
/// Parse bump parameters.
/// </summary>
/// <param name="param">list of paramers</param>
/// <param name="mtlData">material data to be updated</param>
/// <remarks>Only the bump map texture path is used here.</remarks>
/// <seealso cref="https://github.com/hammmm/unity-obj-loader"/>
private void ParseBumpParameters(string[] param, MaterialData mtlData)
{
Regex regexNumber = new Regex(@"^[-+]?[0-9]*\.?[0-9]+$");
var bumpParams = new Dictionary <string, BumpParamDef>();
bumpParams.Add("bm", new BumpParamDef("bm", "string", 1, 1));
bumpParams.Add("clamp", new BumpParamDef("clamp", "string", 1, 1));
bumpParams.Add("blendu", new BumpParamDef("blendu", "string", 1, 1));
bumpParams.Add("blendv", new BumpParamDef("blendv", "string", 1, 1));
bumpParams.Add("imfchan", new BumpParamDef("imfchan", "string", 1, 1));
bumpParams.Add("mm", new BumpParamDef("mm", "string", 1, 1));
bumpParams.Add("o", new BumpParamDef("o", "number", 1, 3));
bumpParams.Add("s", new BumpParamDef("s", "number", 1, 3));
bumpParams.Add("t", new BumpParamDef("t", "number", 1, 3));
bumpParams.Add("texres", new BumpParamDef("texres", "string", 1, 1));
int pos = 1;
string filename = null;
while (pos < param.Length)
{
if (!param[pos].StartsWith("-"))
{
filename = param[pos];
pos++;
continue;
}
// option processing
string optionName = param[pos].Substring(1);
pos++;
if (!bumpParams.ContainsKey(optionName))
{
continue;
}
BumpParamDef def = bumpParams[optionName];
ArrayList args = new ArrayList();
int i = 0;
bool isOptionNotEnough = false;
for (; i < def.valueNumMin; i++, pos++)
{
if (pos >= param.Length)
{
isOptionNotEnough = true;
break;
}
if (def.valueType == "number")
{
Match match = regexNumber.Match(param[pos]);
if (!match.Success)
{
isOptionNotEnough = true;
break;
}
}
args.Add(param[pos]);
}
if (isOptionNotEnough)
{
Debug.Log("bump variable value not enough for option:" + optionName + " of material:" + mtlData.materialName);
continue;
}
for (; i < def.valueNumMax && pos < param.Length; i++, pos++)
{
if (def.valueType == "number")
{
Match match = regexNumber.Match(param[pos]);
if (!match.Success)
{
break;
}
}
args.Add(param[pos]);
}
// TODO: some processing of options
Debug.Log("found option: " + optionName + " of material: " + mtlData.materialName + " args: " + string.Concat(args.ToArray()));
}
// set the file name, if found
// TODO: other parsed parameters are not used for now
if (filename != null)
{
mtlData.bumpTexPath = filename;
}
}
/// <summary>
/// Build a Unity Material from MaterialData
/// </summary>
/// <param name="md">material data</param>
/// <returns>Unity material</returns>
private Material BuildMaterial(MaterialData md)
{
string shaderName = "Standard"; // (md.illumType == 2) ? "Standard (Specular setup)" : "Standard";
bool specularMode = false; // (md.specularTex != null);
ModelUtil.MtlBlendMode mode = md.overallAlpha < 1.0f ? ModelUtil.MtlBlendMode.TRANSPARENT : ModelUtil.MtlBlendMode.OPAQUE;
bool useUnlit = buildOptions != null && buildOptions.litDiffuse &&
md.diffuseTex != null &&
md.bumpTex == null &&
md.opacityTex == null &&
md.specularTex == null &&
!md.hasReflectionTex;
bool?diffuseIsTransparent = null;
if (useUnlit)
{
// do not use unlit shader if the texture has transparent pixels
diffuseIsTransparent = ModelUtil.ScanTransparentPixels(md.diffuseTex, ref mode);
}
if (useUnlit && !diffuseIsTransparent.Value)
{
shaderName = "Unlit/Texture";
}
else if (specularMode)
{
shaderName = "Standard (Specular setup)";
}
Material newMaterial = new Material(Shader.Find(shaderName)); // "Standard (Specular setup)"
newMaterial.name = md.materialName;
float shinLog = Mathf.Log(md.shininess, 2);
// get the metallic value from the shininess
float metallic = Mathf.Clamp01(shinLog / 10.0f);
// get the smoothness from the shininess
float smoothness = Mathf.Clamp01(shinLog / 10.0f);
if (specularMode)
{
newMaterial.SetColor("_SpecColor", md.specularColor);
newMaterial.SetFloat("_Shininess", md.shininess / 1000.0f);
//m.color = new Color( md.diffuse.r, md.diffuse.g, md.diffuse.b, md.alpha);
}
else
{
newMaterial.SetFloat("_Metallic", metallic);
//m.SetFloat( "_Glossiness", md.shininess );
}
if (md.diffuseTex != null)
{
// diffuse
if (md.opacityTex != null)
{
// diffuse + opacity:
// update diffuse texture if an opacity map was found
int w = md.diffuseTex.width;
int h = md.diffuseTex.width;
Texture2D albedoTexture = new Texture2D(w, h, TextureFormat.ARGB32, false);
Color col = new Color();
for (int x = 0; x < albedoTexture.width; x++)
{
for (int y = 0; y < albedoTexture.height; y++)
{
col = md.diffuseTex.GetPixel(x, y);
col.a *= md.opacityTex.GetPixel(x, y).grayscale;
// blend diffuse and opacity textures
albedoTexture.SetPixel(x, y, col);
}
}
albedoTexture.name = md.diffuseTexPath;
albedoTexture.Apply();
// mode = ModelUtil.MtlBlendMode.TRANSPARENT;
// The map_d value is multiplied by the d value --> Fade mode
mode = ModelUtil.MtlBlendMode.FADE;
#if UNITY_EDITOR
if (!string.IsNullOrEmpty(alternativeTexPath))
{
string texAssetPath = AssetDatabase.GetAssetPath(md.opacityTex);
if (!string.IsNullOrEmpty(texAssetPath))
{
EditorUtil.SaveAndReimportPngTexture(ref albedoTexture, texAssetPath, "_alpha");
}
}
#endif
newMaterial.SetTexture("_MainTex", albedoTexture);
}
else
{// md.opacityTex == null
// diffuse without opacity: if there are transparent pixels ==> transparent material
if (!diffuseIsTransparent.HasValue)
{
diffuseIsTransparent = ModelUtil.ScanTransparentPixels(md.diffuseTex, ref mode);
}
newMaterial.SetTexture("_MainTex", md.diffuseTex);
}
//Debug.LogFormat("Diffuse set for {0}",m.name);
}
else if (md.opacityTex != null)
{
// opacity without diffuse
//mode = ModelUtil.MtlBlendMode.TRANSPARENT;
mode = ModelUtil.MtlBlendMode.FADE;
int w = md.opacityTex.width;
int h = md.opacityTex.width;
Texture2D albedoTexture = new Texture2D(w, h, TextureFormat.ARGB32, false);
Color col = new Color();
bool detected = false;
for (int x = 0; x < albedoTexture.width; x++)
{
for (int y = 0; y < albedoTexture.height; y++)
{
col = md.diffuseColor;
col.a = md.overallAlpha * md.opacityTex.GetPixel(x, y).grayscale;
ModelUtil.DetectMtlBlendFadeOrCutout(col.a, ref mode, ref detected);
//if (md.alpha == 1.0f && col.a == 0.0f) mode = ModelUtil.MtlBlendMode.CUTOUT;
albedoTexture.SetPixel(x, y, col);
}
}
albedoTexture.name = md.diffuseTexPath;
albedoTexture.Apply();
#if UNITY_EDITOR
if (!string.IsNullOrEmpty(alternativeTexPath))
{
string texAssetPath = AssetDatabase.GetAssetPath(md.opacityTex);
if (!string.IsNullOrEmpty(texAssetPath))
{
EditorUtil.SaveAndReimportPngTexture(ref albedoTexture, texAssetPath, "_op");
}
}
#endif
newMaterial.SetTexture("_MainTex", albedoTexture);
}
md.diffuseColor.a = md.overallAlpha;
newMaterial.SetColor("_Color", md.diffuseColor);
md.emissiveColor.a = md.overallAlpha;
newMaterial.SetColor("_EmissionColor", md.emissiveColor);
if (md.emissiveColor.r > 0 || md.emissiveColor.g > 0 || md.emissiveColor.b > 0)
{
newMaterial.EnableKeyword("_EMISSION");
}
if (md.bumpTex != null)
{
// bump map defined
// TODO: if importing assets do not create a nomal map, change importer settings
// let (improperly) assign a normal map to the bumb map
// if the file name contains a specific tag
// TODO: customize normal map tag
if (md.bumpTexPath.Contains("_normal_map"))
{
newMaterial.EnableKeyword("_NORMALMAP");
newMaterial.SetFloat("_BumpScale", 0.25f); // lower the bump effect with the normal map
newMaterial.SetTexture("_BumpMap", md.bumpTex);
}
else
{
// calculate normal map
Texture2D normalMap = ModelUtil.HeightToNormalMap(md.bumpTex);
#if UNITY_EDITOR
if (!string.IsNullOrEmpty(alternativeTexPath))
{
string texAssetPath = AssetDatabase.GetAssetPath(md.bumpTex);
if (!string.IsNullOrEmpty(texAssetPath))
{
EditorUtil.SaveAndReimportPngTexture(ref normalMap, texAssetPath, "_nm", true);
}
}
else
#endif
{
newMaterial.SetTexture("_BumpMap", normalMap);
//newMaterial.SetTexture("_BumpMap", md.bumpTex);
newMaterial.EnableKeyword("_NORMALMAP");
newMaterial.SetFloat("_BumpScale", 1.0f); // adjust the bump effect with the normal map
}
}
}
if (md.specularTex != null)
{
Texture2D glossTexture = new Texture2D(md.specularTex.width, md.specularTex.height, TextureFormat.ARGB32, false);
Color col = new Color();
float pix = 0.0f;
for (int x = 0; x < glossTexture.width; x++)
{
for (int y = 0; y < glossTexture.height; y++)
{
pix = md.specularTex.GetPixel(x, y).grayscale;
// red = metallic
col.r = metallic * pix;// md.specular.grayscale*pix;
col.g = col.r;
col.b = col.r;
// alpha = smoothness
// if reflecting set maximum smoothness value, else use a precomputed value
if (md.hasReflectionTex)
{
col.a = pix;
}
else
{
col.a = pix * smoothness;
}
glossTexture.SetPixel(x, y, col);
}
}
glossTexture.Apply();
#if UNITY_EDITOR
if (!string.IsNullOrEmpty(alternativeTexPath))
{
string texAssetPath = AssetDatabase.GetAssetPath(md.specularTex);
if (!string.IsNullOrEmpty(texAssetPath))
{
EditorUtil.SaveAndReimportPngTexture(ref glossTexture, texAssetPath, "_spec");
}
}
#endif
if (specularMode)
{
newMaterial.EnableKeyword("_SPECGLOSSMAP");
newMaterial.SetTexture("_SpecGlossMap", glossTexture);
}
else
{
newMaterial.EnableKeyword("_METALLICGLOSSMAP");
newMaterial.SetTexture("_MetallicGlossMap", glossTexture);
}
//m.SetTexture( "_MetallicGlossMap", md.specularLevelTex );
}
// replace the texture with Unity environment reflection
if (md.hasReflectionTex)
{
if (md.overallAlpha < 1.0f)
{
Color col = Color.white;
col.a = md.overallAlpha;
newMaterial.SetColor("_Color", col);
mode = ModelUtil.MtlBlendMode.FADE;
}
// the "amount of" info is missing, using a default value
if (md.specularTex != null)
{
newMaterial.SetFloat("_Metallic", metallic);// 1.0f);
}
// usually the reflection texture is not blurred
newMaterial.SetFloat("_Glossiness", 1.0f);
}
ModelUtil.SetupMaterialWithBlendMode(newMaterial, mode);
//#if UNITY_EDITOR
// if (!string.IsNullOrEmpty(alternateTexPath))
// {
// string path = alternateTexPath + "../Materials/" + m.name + ".mat";
// path = path.Replace("Textures/../", "");
// Debug.LogFormat("Creating material asset in {0}", path);
// AssetDatabase.CreateAsset(m, path);
// m = AssetDatabase.LoadAssetAtPath<Material>(path);
// }
//#endif
return(newMaterial);
}
/// <summary>
/// Parse the material library lines to get material data.
/// </summary>
/// <param name="lines">lines read from the material library file</param>
/// <param name="mtlData">list of material data</param>
private void ParseMaterialData(string[] lines, List <MaterialData> mtlData)
{
MaterialData current = new MaterialData();
char[] separators = new char[] { ' ', '\t' };
for (int i = 0; i < lines.Length; i++)
{
string line = lines[i].Trim();
// remove comments
if (line.IndexOf("#") != -1)
{
line = line.Substring(0, line.IndexOf("#"));
}
string[] p = line.Split(separators, StringSplitOptions.RemoveEmptyEntries);
if (p.Length == 0 || string.IsNullOrEmpty(p[0]))
{
continue;
}
string parameters = null;
if (line.Length > p[0].Length)
{
parameters = line.Substring(p[0].Length + 1).Trim();
}
try
{
switch (p[0])
{
case "newmtl":
current = new MaterialData();
current.materialName = DataSet.FixMaterialName(parameters);
mtlData.Add(current);
break;
case "Ka": // Ambient component (not supported)
current.ambientColor = StringsToColor(p);
break;
case "Kd": // Diffuse component
current.diffuseColor = StringsToColor(p);
break;
case "Ks": // Specular component
current.specularColor = StringsToColor(p);
break;
case "Ke": // Specular component
current.emissiveColor = StringsToColor(p);
break;
case "Ns": // Specular exponent --> shininess
current.shininess = ParseFloat(p[1]);
break;
case "d": // dissolve into the background (1=opaque, 0=transparent)
current.overallAlpha = p.Length > 1 && p[1] != "" ? ParseFloat(p[1]) : 1.0f;
break;
case "Tr": // Transparency
current.overallAlpha = p.Length > 1 && p[1] != "" ? 1.0f - ParseFloat(p[1]) : 1.0f;
break;
case "map_KD":
case "map_Kd": // Color texture, diffuse reflectivity
if (!string.IsNullOrEmpty(parameters))
{
current.diffuseTexPath = parameters;
}
break;
// TODO: different processing needed, options not supported
case "map_Ks": // specular reflectivity of the material
case "map_kS":
case "map_Ns": // Scalar texture for specular exponent
if (!string.IsNullOrEmpty(parameters))
{
current.specularTexPath = parameters;
}
break;
case "map_bump": // Bump map texture
if (!string.IsNullOrEmpty(parameters))
{
current.bumpTexPath = parameters;
}
break;
case "bump":
ParseBumpParameters(p, current);
break;
case "map_opacity":
case "map_d": // Scalar texture modulating the dissolve into the background
if (!string.IsNullOrEmpty(parameters))
{
current.opacityTexPath = parameters;
}
break;
case "illum": // Illumination model. 1 - diffuse, 2 - specular (not used)
current.illumType = int.Parse(p[1]);
break;
case "refl": // reflection map (replaced with Unity environment reflection)
if (!string.IsNullOrEmpty(parameters))
{
current.hasReflectionTex = true;
}
break;
case "map_Ka": // ambient reflectivity color texture
case "map_kA":
if (!string.IsNullOrEmpty(parameters))
{
Debug.Log("Map not supported:" + line);
}
break;
default:
//Debug.Log("this line was not processed :" + line);
break;
}
}
catch (Exception e)
{
Debug.LogErrorFormat("Error at line {0} in mtl file: {1}", i + 1, e);
}
}
}