diff options
Diffstat (limited to 'render_povray/object_particles.py')
| -rwxr-xr-x | render_povray/object_particles.py | 84 |
1 files changed, 62 insertions, 22 deletions
diff --git a/render_povray/object_particles.py b/render_povray/object_particles.py index 2d4f0dcc..4949af21 100755 --- a/render_povray/object_particles.py +++ b/render_povray/object_particles.py @@ -20,9 +20,30 @@ """Get some Blender particle objects translated to POV.""" import bpy +import random -def export_hair(file, ob, p_sys, global_matrix, write_matrix): +def pixel_relative_guess(ob): + """Convert some object x dimension to a rough pixel relative order of magnitude""" + from bpy_extras import object_utils + scene = bpy.context.scene + cam = scene.camera + render = scene.render + # Get rendered image resolution + output_x_res = render.resolution_x + focal_length = cam.data.lens + # Get object bounding box size + object_location = ob.location + object_dimension_x = ob.dimensions[0] + world_to_camera = object_utils.world_to_camera_view(scene, cam, object_location) + + apparent_size = (object_dimension_x * focal_length) / world_to_camera[2] + sensor_width = cam.data.sensor_width + pixel_pitch_x = sensor_width / output_x_res + return apparent_size / pixel_pitch_x + + +def export_hair(file, ob, mod, p_sys, global_matrix, write_matrix): """Get Blender path particles (hair strands) objects translated to POV sphere_sweep unions.""" # tstart = time.time() textured_hair = 0 @@ -33,18 +54,30 @@ def export_hair(file, ob, p_sys, global_matrix, write_matrix): povtex = th.texture # slot.name tex = bpy.data.textures[povtex] - if th and th.use: - if (tex.type == 'IMAGE' and tex.image) or tex.type != 'IMAGE': - if th.use_map_color_diffuse: - textured_hair = 1 + if ( + th + and th.use + and ( + (tex.type == 'IMAGE' and tex.image) or tex.type != 'IMAGE' + ) + and th.use_map_color_diffuse + ): + textured_hair = 1 if pmaterial.strand.use_blender_units: strand_start = pmaterial.strand.root_size strand_end = pmaterial.strand.tip_size - strand_shape = pmaterial.strand.shape - else: # Blender unit conversion - strand_start = pmaterial.strand.root_size / 200.0 - strand_end = pmaterial.strand.tip_size / 200.0 - strand_shape = pmaterial.strand.shape + else: + try: + # inexact pixel size, just to make radius relative to screen and object size. + pixel_fac = pixel_relative_guess(ob) + except ZeroDivisionError: + # Fallback to hardwired constant value + pixel_fac = 4500 + print("no pixel size found for stand radius, falling back to %i" % pixel_fac) + + strand_start = pmaterial.strand.root_size / pixel_fac + strand_end = pmaterial.strand.tip_size / pixel_fac + strand_shape = pmaterial.strand.shape else: pmaterial = "default" # No material assigned in blender, use default one strand_start = 0.01 @@ -63,7 +96,7 @@ def export_hair(file, ob, p_sys, global_matrix, write_matrix): total_number_of_strands = p_sys.settings.count + p_sys.settings.rendered_child_count # hairCounter = 0 file.write('#declare HairArray = array[%i] {\n' % total_number_of_strands) - for pindex in range(0, total_number_of_strands): + for pindex in range(total_number_of_strands): # if particle.is_exist and particle.is_visible: # hairCounter += 1 @@ -119,7 +152,7 @@ def export_hair(file, ob, p_sys, global_matrix, write_matrix): else: # only overwrite variable for each competing texture for now init_color = tex.evaluate((init_coord[0], init_coord[1], init_coord[2])) - for step in range(0, steps): + for step in range(steps): coord = ob.matrix_world.inverted() @ (p_sys.co_hair(ob, particle_no=pindex, step=step)) # for controlPoint in particle.hair_keys: if p_sys.settings.clump_factor != 0: @@ -127,9 +160,16 @@ def export_hair(file, ob, p_sys, global_matrix, write_matrix): elif step == 0: hair_strand_diameter = strand_start else: - hair_strand_diameter += (strand_end - strand_start) / ( + if strand_shape != 0.0: + if strand_shape < 0.0: + fac = pow(step, (1.0 + strand_shape)) + else: + fac = pow(step, (1.0 / (1.0 - strand_shape))) + else: + fac = step + hair_strand_diameter += fac * (strand_end - strand_start) / ( p_sys.settings.display_step + 1 - ) # XXX +1 or not? # XXX use strand_shape in formula + ) # XXX +1 or -1 or nothing ? if step == 0 and p_sys.settings.use_hair_bspline: # Write three times the first point to compensate pov Bezier handling file.write( @@ -162,9 +202,7 @@ def export_hair(file, ob, p_sys, global_matrix, write_matrix): # All coordinates except the last need a following comma. - if step != steps - 1: - file.write(',\n') - else: + if step == steps - 1: if textured_hair: # Write pigment and alpha (between Pov and Blender, # alpha 0 and 1 are reversed) @@ -175,6 +213,8 @@ def export_hair(file, ob, p_sys, global_matrix, write_matrix): # End the sphere_sweep declaration for this hair file.write('}\n') + else: + file.write(',\n') # All but the final sphere_sweep (each array element) needs a terminating comma. if pindex != total_number_of_strands: file.write(',\n') @@ -212,10 +252,10 @@ def export_hair(file, ob, p_sys, global_matrix, write_matrix): file.write(' #local I = 0;\n') file.write(' #while (I < %i)\n' % total_number_of_strands) file.write(' object {HairArray[I]') - if not textured_hair: - file.write(' texture{HairTexture}\n') - else: + if textured_hair: file.write('\n') + else: + file.write(' texture{HairTexture}\n') # Translucency of the hair: file.write(' hollow\n') file.write(' double_illuminate\n') @@ -243,8 +283,8 @@ def export_hair(file, ob, p_sys, global_matrix, write_matrix): write_matrix(global_matrix @ ob.matrix_world) file.write('}') - print('Totals hairstrands written: %i' % total_number_of_strands) - print('Number of tufts (particle systems)', len(ob.particle_systems)) + print("Totals hairstrands written: %i" % total_number_of_strands) + print("Number of tufts (particle systems)", len(ob.particle_systems)) # Set back the displayed number of particles to preview count # p_sys.set_resolution(scene, ob, 'PREVIEW') #DEPRECATED |