vector.c - bugfix, vec.w accessed vec[4] not vec[3]! (probably my fault)

Texture.c - added "val = tex.evaluate(vec)" so you can find the color/intensity at a given loaction for a texture.

source/blender/python/api2_2x/Texture.c

@@ -53,6 +53,9 @@
 #include "blendef.h"
 #include "gen_utils.h"
 
+#include "vector.h" /* for Texture_evaluate(vec) */
+#include "RE_shader_ext.h"
+
 /*****************************************************************************/
 /* Blender.Texture constants                                                 */
 /*****************************************************************************/
@@ -487,6 +490,8 @@ static int Texture_setImageFlags( BPy_Texture *self, PyObject *args,
 								void *type );
 static int Texture_setNoiseBasis2( BPy_Texture *self, PyObject *args,
 								void *type );
+								
+static PyObject *Texture_evaluate( BPy_Texture *self, PyObject *args );
 
 /*****************************************************************************/
 /* Python BPy_Texture methods table:                                         */
@@ -529,6 +534,8 @@ static PyMethodDef BPy_Texture_methods[] = {
 	 "(s) - Set Dist Noise"},
 	{"setDistMetric", ( PyCFunction ) Texture_oldsetDistMetric, METH_VARARGS,
 	 "(s) - Set Dist Metric"},
+	{"evaluate", ( PyCFunction ) Texture_evaluate, METH_VARARGS,
+	 "(vector) - evaluate the texture at this position"},
 	{NULL, NULL, 0, NULL}
 };
 
@@ -2644,3 +2651,25 @@ static PyObject *Texture_oldsetImageFlags( BPy_Texture * self, PyObject * args )
 	Py_RETURN_NONE;
 }
 
+static PyObject *Texture_evaluate( BPy_Texture * self, PyObject * args )
+{
+	VectorObject *vec_in = NULL;
+	TexResult texres= {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0, NULL};
+	float vec[4];
+	/* int rgbnor; dont use now */
+	
+	if(!PyArg_ParseTuple(args, "O!", &vector_Type, &vec_in) || vec_in->size < 3)
+		return EXPP_ReturnPyObjError(PyExc_TypeError, 
+			"expects a 3D vector object\n");
+	
+	/* rgbnor = .. we dont need this now */
+	multitex_ext(self->texture, vec_in->vec, 1, 1, 1, &texres);
+	
+	vec[0] = texres.tr;
+	vec[1] = texres.tg;
+	vec[2] = texres.tb;
+	vec[3] = texres.tin;
+	
+	return newVectorObject(vec, 4, Py_NEW);
+}
+

source/blender/python/api2_2x/doc/Texture.py

@@ -469,6 +469,15 @@ class Texture:
 				and 'DistNoise'
 		@type type: string
 		"""
+	def evaluate(coord):
+		"""
+		Evaluates the texture at this location and returns the result.
+		
+		The return value is a 4D vector where (x,y,z,w) are (red, green, blue, intensity)
+		For greyscale textures, often intensity only will be used.
+		@type coord: vector
+		"""
+		
 import id_generics
 Texture.__doc__ += id_generics.attributes
 

source/blender/python/api2_2x/vector.c

@@ -959,7 +959,7 @@ static PyObject *Vector_getAxis( VectorObject * self, void *type )
 			return EXPP_ReturnPyObjError(PyExc_AttributeError,
 				"vector.w: error, cannot get this axis for a 3D vector\n");
 	
-		return PyFloat_FromDouble(self->vec[4]);
+		return PyFloat_FromDouble(self->vec[3]);
 	default:
 		{
 			char errstr[1024];