You will want to make a black and white picture of what a gate would look like if you were looking at it straight on. You can make this in any paint program you like. The background color will be black and the gate color will be white. I made my canvas size 500 X 500. You will save it as a jpeg or bmp. You can also draw the black and white gate right in the Bryce Editing Box, but it is much easier to make it in a paint program--I would leave that up to advanced users.
Open a new document in Bryce. In the Create menu, click on Symmetrical Lattice.
Next to the Symmetrical Lattice wireframe, click on the E to Edit the object.
On the right in the Editing Tools box, click on the Pictures Tab.
Click on Load above the first small picture.
Browse your computer to find the black and white picture that you made in the beginning. Click Open.
You will do the same thing for the second small picture. Click on Load above the second small picture and browse your computer for the same black and white picture you made in the beginning. Click Open and you will notice all three pictures are showing your black and white gate. Click Apply.
You will now notice the big picture changed to your picture. Click the checkmark to apply your changes.
Click on Edit all the way to the top to get to the Edit menu.
Click, hold and pull the Y handle (top) of the Resize tool to the left to shorten the object.
Now using the Rotate tool, click hold and pull the X handle to the right until you see -90.00 at the bottom left corner of your Bryce window.
Using the same Rotate tool, click hold and pull the Y handle to the left until you see -45.00 at the bottom left corner of your Bryce window. The gate is now facing you.
You can resize your object if you like by using the Resize tool--click hold and pull to the right in the middle of the tool until your object reaches the desired size.
Click the arrow next to the gate (symmetrical lattice) to make the object touch the ground plane.
You can now click the render ball to see what your gate looks like.
If you move the Camera Trackball, you can see how thick the gate is and decide if you like the thickness or not.
I wanted mine a bit thinner so I clicked the A next to the gate wireframe.
You will want to change the number in the Y column of the size row.
A 2 or a 1 size is good for the thickness. Change the number and click the checkmark to apply your changes.
You can now render it to see the changes and then click the Default View Control dot to view the project normally.
You can edit the materials now by clicking the tiny arrow next to "Edit" at the top.
A lot of gates are Cast Iron, so you can click "Metals" and then the Cast Iron icon. Click the checkmark to apply your changes.
You can render and you now have a gate! Use your imagination and you can make some very intriquite gates.
For my final gate picture, I used the black and white picture made for this tutorial and also the one I made below.
For the gate at the top, I made this black and white picture.
I put the gates with the round circles in the middle of the other two and rotated them so they looked open. I made stairs by multi-replicating rectangular boxes. I added the gate at the top, deleted the default ground plane and created a volumetric cloud plane on the bottom and the top. I then saved and brought the image into PSP. I added a sunburst effect and then added glare to the tips of the gates to make it look shinier.
Hope you like it!