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assimp: Support importing alpha mode from glTF files

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rdb 2022-11-02 20:49:43 +01:00
parent 9248182a0b
commit b254e5b7ba
1 changed files with 19 additions and 0 deletions
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19
pandatool/src/assimp/assimpLoader.cxx
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@ -21,9 +21,11 @@
#include "geomTriangles.h"
#include "pnmFileTypeRegistry.h"
#include "pnmImage.h"
#include "alphaTestAttrib.h"
#include "materialAttrib.h"
#include "textureAttrib.h"
#include "cullFaceAttrib.h"
#include "transparencyAttrib.h"
#include "ambientLight.h"
#include "directionalLight.h"
#include "spotlight.h"
@ -43,6 +45,10 @@
#include <assimp/postprocess.h>
#ifndef AI_MATKEY_GLTF_ALPHAMODE
#define AI_MATKEY_GLTF_ALPHAMODE "$mat.gltf.alphaMode", 0, 0
#endif
using std::ostringstream;
using std::stringstream;
using std::string;
@ -502,6 +508,19 @@ load_material(size_t index) {
}
}
// Alpha mode.
aiString alpha_mode;
if (AI_SUCCESS == mat.Get(AI_MATKEY_GLTF_ALPHAMODE, alpha_mode)) {
if (strcmp(alpha_mode.C_Str(), "MASK") == 0) {
PN_stdfloat cutoff = 0.5;
mat.Get(AI_MATKEY_GLTF_ALPHACUTOFF, cutoff);
state = state->add_attrib(AlphaTestAttrib::make(AlphaTestAttrib::M_greater_equal, cutoff));
}
else if (strcmp(alpha_mode.C_Str(), "BLEND") == 0) {
state = state->add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_alpha));
}
}
// And let's not forget the textures!
CPT(TextureAttrib) tattr = DCAST(TextureAttrib, TextureAttrib::make());
CPT(TexMatrixAttrib) tmattr;