Indigo Renderer Forum

yonosoy wrote: ↑

Tue Jun 23, 2020 1:55 am

8.25 millions of instances.
Works well, thank you Ono!
quickrender_4.jpg

Hello Wob.
Here is an old example pigs that contains the satter function.
Actually there is no possibbility of use inside Cinema. ATM only Skindigo has implemented the scatter function.
You must setup the scatters in XML. Noticed that the meshes to be scattered requires the "mesh UID" and the target object requires the "object UID".
scatter_material_test.pigs
If Cindigo must write 8.25 millions of instances in the igs... you need hours of exportation. Indigo´s scatter put the instances directly in scene...
Hope that it will be implemented inside Cindigo someday.

yonosoy wrote: ↑

Tue Jun 23, 2020 4:29 am

Open the exported quickrender.igs in notepad. This is, XML (the text language of Indigo and many other programs).
So, the procedure:
1- Export the scene (with the objects to be scattered and the target object, as is).
2- Open the igs in a text editor.
3- Add this code at the end:

Code: Select all

	<scatter>
		<uid>800000</uid>
		<name>the scatter</name>
		<shader>
				<shader><![CDATA[  
                				   
def evalScale(int index) real :
  1.0
    
def evalCreate(int index, vec3 p) bool :
  true
						]]></shader>
		</shader>
		<proto_object_groups>
			<proto_object_group>
				<geometry_uid>8</geometry_uid>
				<materials>
					<material_uid>7</material_uid>
				</materials>
				<weight>1</weight>
			</proto_object_group>
		</proto_object_groups>
		<density>2</density>
		<seed>1</seed>
		<view_culling>true</view_culling>
		<orient_normal>false</orient_normal>
		<scale_std_dev>0.35</scale_std_dev>
		<height_std_dev>0.2</height_std_dev>
		<evenness>0.02</evenness>
		<z_offset>0</z_offset>
		<target_object_uid>25</target_object_uid>
	</scatter>

4- Change the geometry_uid and the material_uid to fit your object to be scattered (you can repeat a chain of code to scatter multiple objects).
geometry_uid > uid of the mesh in the file.
material_uid > uid of the material of the object.
5- Change the target_object_uid, use the uid of the model2 in the file.
6- setup parameters.

If you want to scatter more than one object looks like this:

Code: Select all

		<proto_object_groups>
			<proto_object_group>
				<geometry_uid>8</geometry_uid>
				<materials>
					<material_uid>7</material_uid>
				</materials>
				<weight>1</weight>
				<geometry_uid>12</geometry_uid>
				<materials>
					<material_uid>11</material_uid>
				</materials>
				<weight>1</weight>
			</proto_object_group>
		</proto_object_groups>

If your object has more than one material:

Code: Select all

			<proto_object_group>
				<geometry_uid>8</geometry_uid>
				<materials>
					<material_uid>7</material_uid>
					<material_uid>16</material_uid>
				</materials>
				<weight>1</weight>
			</proto_object_group>

Hope this help.

yonosoy wrote: ↑

Thu Jun 25, 2020 6:41 am

.
Scatter_01_00000.jpg
.
The right procedure is to use several protogroups, one per object to be scattered (instructions corrected).
20 million. Scale of grass X2.