def __init__(self):
# Setup window size and title
load_prc_file_data(
"",
"""
# win-size 1600 900
window-title Render Pipeline - Instancing Example
""",
)
# Construct the render pipeline
self.render_pipeline = RenderPipeline()
self.render_pipeline.create(self)
self.render_pipeline.daytime_mgr.time = "19:17"
# self.render_pipeline.daytime_mgr.time = "12:00"
# Load the scene
model = self.loader.load_model("scene/Scene.bam")
model.reparent_to(self.render)
# Find the prefab object, we are going to in instance this object
# multiple times
prefab = model.find("**/InstancedObjectPrefab")
# Collect all instances
matrices = []
for elem in model.find_all_matches("**/PREFAB*"):
matrices.append(elem.get_mat(self.render))
elem.remove_node()
print("Loaded", len(matrices), "instances!")
# Allocate storage for the matrices, each matrix has 16 elements,
# but because one pixel has four components, we need amount * 4 pixels.
buffer_texture = Texture()
buffer_texture.setup_buffer_texture(len(matrices) * 4, Texture.T_float, Texture.F_rgba32, GeomEnums.UH_static)
float_size = len(struct.pack("f", 0.0))
floats = []
# Serialize matrices to floats
ram_image = buffer_texture.modify_ram_image()
for idx, mat in enumerate(matrices):
for i in range(4):
for j in range(4):
floats.append(mat.get_cell(i, j))
# Write the floats to the texture
data = struct.pack("f" * len(floats), *floats)
ram_image.set_subdata(0, len(data), data)
# Load the effect
self.render_pipeline.set_effect(prefab, "effects/basic_instancing.yaml", {})
prefab.set_shader_input("InstancingData", buffer_texture)
prefab.set_instance_count(len(matrices))
# We have do disable culling, so that all instances stay visible
prefab.node().set_bounds(OmniBoundingVolume())
prefab.node().set_final(True)
# Initialize movement controller, this is a convenience class
# to provide an improved camera control compared to Panda3Ds default
# mouse controller.
self.controller = MovementController(self)
self.controller.set_initial_position_hpr(Vec3(-23.2, -32.5, 5.3), Vec3(-33.8, -8.3, 0.0))
self.controller.setup()
